…c#224611)

**Addresses:** elastic#202079
**Relates to:** elastic#222796

## Summary

This PR implements Prebuilt Rules export [test plan](https://github.com/elastic/kibana/blob/main/x-pack/solutions/security/plugins/security_solution/docs/testing/test_plans/detection_response/prebuilt_rules/prebuilt_rule_export.md).

Existing tests were adjusted and extended to match the test plan.

## Caveats

The test plan describes a scenario to verify prebuilt rules export fails for 10K+ rules but this scenario is tricky to implement. Due to ES limitations on filtering more than 10K the majority of utility functions like `deleteAllRules()` fail. The proper implementation requires proper setup and cleanup to make sure the test doesn't block the testing workflow.

As the result of the mentioned complexities implementation of the test scenario for 10K+ rules is skipped in this PR.

(cherry picked from commit 6120cae)

# Conflicts:
#	x-pack/solutions/security/plugins/security_solution/docs/testing/test_plans/detection_response/prebuilt_rules/prebuilt_rule_export.md