…akiness in integration tests (#227689) (#228814)

# Backport

This will backport the following commits from `main` to `8.18`:
- [[Security Solution] Fix real prebuilt rules package related flakiness
in integration tests
(#227689)](#227689)

<!--- Backport version: 10.0.1 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Maxim
Palenov","email":"maxim.palenov@elastic.co"},"sourceCommit":{"committedDate":"2025-07-21T12:42:34Z","message":"[Security
Solution] Fix real prebuilt rules package related flakiness in
integration tests (#227689)\n\n**Resolves:
https://github.com/elastic/kibana/issues/220333**\n**Resolves:
https://github.com/elastic/kibana/issues/227571**\n**Resolves:
https://github.com/elastic/kibana/issues/219407**\n\n## Summary\n\nThis
PR fixes flakiness caused by the real prebuilt rules package
installation.\n\n## Details\n\nMultiple Rule Management API endpoints
install the prebuilt rules package under the hood when it's not
installed. In normal case this installation happens from the EPR. The
problem is that EPR might be unavailable for some period of time or
there network issues blocking EPR access. On top of that real package is
heavy and requires some time and resources to be installed. While the
major part of our functionality doesn't depend on the real prebuilt
rules package and the concrete rules there. On top of that API endpoints
depending on the real prebuilt rules package fail with HTTP 500 error
when EPR is unavailable.\n\nThis PR extends the Functional Test Runner
with `rootHooks.beforeAll` configuration option which is used to install
a lightweight mock prebuilt rules package. This action prevents real
package installation make the tests much more predictable.\n\n## Flaky
test runner\n\n- ✅ [ECH import custom rules integration tests (200
runs)](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/8627)\n-
✅ [Serverless import custom rules integration tests (200
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integration tests (#227689)\n\n**Resolves:
https://github.com/elastic/kibana/issues/220333**\n**Resolves:
https://github.com/elastic/kibana/issues/227571**\n**Resolves:
https://github.com/elastic/kibana/issues/219407**\n\n## Summary\n\nThis
PR fixes flakiness caused by the real prebuilt rules package
installation.\n\n## Details\n\nMultiple Rule Management API endpoints
install the prebuilt rules package under the hood when it's not
installed. In normal case this installation happens from the EPR. The
problem is that EPR might be unavailable for some period of time or
there network issues blocking EPR access. On top of that real package is
heavy and requires some time and resources to be installed. While the
major part of our functionality doesn't depend on the real prebuilt
rules package and the concrete rules there. On top of that API endpoints
depending on the real prebuilt rules package fail with HTTP 500 error
when EPR is unavailable.\n\nThis PR extends the Functional Test Runner
with `rootHooks.beforeAll` configuration option which is used to install
a lightweight mock prebuilt rules package. This action prevents real
package installation make the tests much more predictable.\n\n## Flaky
test runner\n\n- ✅ [ECH import custom rules integration tests (200
runs)](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/8627)\n-
✅ [Serverless import custom rules integration tests (200
runs)](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/8642)","sha":"76908c5fa09ecdca5b7df5458e2a4cc1fba330c9"}},"sourceBranch":"main","suggestedTargetBranches":["8.18"],"targetPullRequestStates":[{"branch":"9.1","label":"v9.1.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"url":"https://github.com/elastic/kibana/pull/228779","number":228779,"state":"MERGED","mergeCommit":{"sha":"67927486cfb64e83f106c715d1e8c9ac33df477a","message":"[9.1]
[Security Solution] Fix real prebuilt rules package related flakiness in
integration tests (#227689) (#228779)\n\n# Backport\n\nThis will
backport the following commits from `main` to `9.1`:\n- [[Security
Solution] Fix real prebuilt rules package related flakiness\nin
integration
tests\n(#227689)](https://github.com/elastic/kibana/pull/227689)\n\n\n\n###
Questions ?\nPlease refer to the [Backport
tool\ndocumentation](https://github.com/sorenlouv/backport)\n\n\n\nCo-authored-by:
Maxim Palenov
<maxim.palenov@elastic.co>"}},{"branch":"8.19","label":"v8.19.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"url":"https://github.com/elastic/kibana/pull/228777","number":228777,"state":"MERGED","mergeCommit":{"sha":"dc37476f1470baad79170f51edee9a432bb6123c","message":"[8.19]
[Security Solution] Fix real prebuilt rules package related flakiness in
integration tests (#227689) (#228777)\n\n# Backport\n\nThis will
backport the following commits from `main` to `8.19`:\n- [[Security
Solution] Fix real prebuilt rules package related flakiness\nin
integration
tests\n(#227689)](https://github.com/elastic/kibana/pull/227689)\n\n\n\n###
Questions ?\nPlease refer to the [Backport
tool\ndocumentation](https://github.com/sorenlouv/backport)\n\n\n\nCo-authored-by:
Maxim Palenov
<maxim.palenov@elastic.co>"}},{"branch":"main","label":"v9.2.0","branchLabelMappingKey":"^v9.2.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/227689","number":227689,"mergeCommit":{"message":"[Security
Solution] Fix real prebuilt rules package related flakiness in
integration tests (#227689)\n\n**Resolves:
https://github.com/elastic/kibana/issues/220333**\n**Resolves:
https://github.com/elastic/kibana/issues/227571**\n**Resolves:
https://github.com/elastic/kibana/issues/219407**\n\n## Summary\n\nThis
PR fixes flakiness caused by the real prebuilt rules package
installation.\n\n## Details\n\nMultiple Rule Management API endpoints
install the prebuilt rules package under the hood when it's not
installed. In normal case this installation happens from the EPR. The
problem is that EPR might be unavailable for some period of time or
there network issues blocking EPR access. On top of that real package is
heavy and requires some time and resources to be installed. While the
major part of our functionality doesn't depend on the real prebuilt
rules package and the concrete rules there. On top of that API endpoints
depending on the real prebuilt rules package fail with HTTP 500 error
when EPR is unavailable.\n\nThis PR extends the Functional Test Runner
with `rootHooks.beforeAll` configuration option which is used to install
a lightweight mock prebuilt rules package. This action prevents real
package installation make the tests much more predictable.\n\n## Flaky
test runner\n\n- ✅ [ECH import custom rules integration tests (200
runs)](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/8627)\n-
✅ [Serverless import custom rules integration tests (200
runs)](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/8642)","sha":"76908c5fa09ecdca5b7df5458e2a4cc1fba330c9"}},{"branch":"8.18","label":"v8.18.4","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"9.0","label":"v9.0.4","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"url":"https://github.com/elastic/kibana/pull/228778","number":228778,"state":"OPEN"}]}]
BACKPORT-->

…uilt rules OOM tests in 8.19 (#245087)

**Partially addresses:** #188090

## Summary

Fleet doesn't have #202435 backported to 8.19. It blocks package removal for packages installed by direct upload. With #228777 we have a We have a mock prebuilt rules package installed via upload at the global hook.

This PR fixes the issue by skipping mock prebuilt rules package installation.