## Summary

Part of elastic/kibana-team#1503

This PR is mostly about moving platform tests from x-pack/test/

Before:

```
x-pack/test/
     | - ftr_apis/
     | - load/
     | - plugin_api_perf/
     | - fleet_packages/
     | - fleet_tasks/
     | - scalability/
     | - task_manager_claimer_update_by_query/
```

After:
```
x-pack/platform/test/
     | - ftr_apis/
     | - load/
     | - plugin_api_perf/
     | - fleet_packages/
     | - fleet_tasks/
     | - scalability/
     | - task_manager_claimer_update_by_query/

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
(cherry picked from commit 58b8c7a)

# Conflicts:
#	.buildkite/ftr_platform_stateful_configs.yml
#	.github/CODEOWNERS
#	x-pack/platform/test/fleet_tasks/config.ts
#	x-pack/platform/test/fleet_tasks/ftr_provider_context.d.ts
#	x-pack/platform/test/fleet_tasks/helpers.ts
#	x-pack/platform/test/fleet_tasks/tests/automatic_upgrades.ts
#	x-pack/platform/test/fleet_tasks/tests/index.ts
#	x-pack/test/fleet_tasks/ftr_provider_context.d.ts
#	x-pack/test/fleet_tasks/tests/index.ts
#	x-pack/test/functional_enterprise_search/ftr_provider_context.d.ts
#	x-pack/test/tsconfig.json
#	x-pack/test/upgrade/apps/logs/index.ts

# Backport

This will backport the following commits from `main` to `8.19`:
- [[ska] [xpack] relocate platform tests
(#225223)](#225223)

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

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

<!--BACKPORT [{"author":{"name":"Dzmitry
Lemechko","email":"dzmitry.lemechko@elastic.co"},"sourceCommit":{"committedDate":"2025-06-25T15:01:04Z","message":"[ska]
[xpack] relocate platform tests (#225223)\n\n## Summary\n\nPart of
https://github.com/elastic/kibana-team/issues/1503\n\nThis PR is mostly
about moving platform tests from
x-pack/test/\n\nBefore:\n\n```\nx-pack/test/\n | - ftr_apis/\n | -
load/\n | - plugin_api_perf/\n | - fleet_packages/\n | - fleet_tasks/\n
| - scalability/\n | -
task_manager_claimer_update_by_query/\n```\n\nAfter:
\n```\nx-pack/platform/test/\n | - ftr_apis/\n | - load/\n | -
plugin_api_perf/\n | - fleet_packages/\n | - fleet_tasks/\n | -
scalability/\n | -
task_manager_claimer_update_by_query/\n\n---------\n\nCo-authored-by:
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[xpack] relocate platform tests (#225223)\n\n## Summary\n\nPart of
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about moving platform tests from
x-pack/test/\n\nBefore:\n\n```\nx-pack/test/\n | - ftr_apis/\n | -
load/\n | - plugin_api_perf/\n | - fleet_packages/\n | - fleet_tasks/\n
| - scalability/\n | -
task_manager_claimer_update_by_query/\n```\n\nAfter:
\n```\nx-pack/platform/test/\n | - ftr_apis/\n | - load/\n | -
plugin_api_perf/\n | - fleet_packages/\n | - fleet_tasks/\n | -
scalability/\n | -
task_manager_claimer_update_by_query/\n\n---------\n\nCo-authored-by:
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[xpack] relocate platform tests (#225223)\n\n## Summary\n\nPart of
https://github.com/elastic/kibana-team/issues/1503\n\nThis PR is mostly
about moving platform tests from
x-pack/test/\n\nBefore:\n\n```\nx-pack/test/\n | - ftr_apis/\n | -
load/\n | - plugin_api_perf/\n | - fleet_packages/\n | - fleet_tasks/\n
| - scalability/\n | -
task_manager_claimer_update_by_query/\n```\n\nAfter:
\n```\nx-pack/platform/test/\n | - ftr_apis/\n | - load/\n | -
plugin_api_perf/\n | - fleet_packages/\n | - fleet_tasks/\n | -
scalability/\n | -
task_manager_claimer_update_by_query/\n\n---------\n\nCo-authored-by:
kibanamachine
<42973632+kibanamachine@users.noreply.github.com>","sha":"58b8c7aec0a6192e6d4ceb6a006b70025038cb21"}},{"branch":"8.19","label":"v8.19.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>