[8.18] [Security Solution] Adds prebuilt rule customization integrati…

…on tests (elastic#207016) (elastic#212314)

# Backport

This will backport the following commits from `main` to `8.18`:
- [[Security Solution] Adds prebuilt rule customization integration
tests (elastic#207016)](elastic#207016)

<!--- Backport version: 9.6.6 -->

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

<!--BACKPORT [{"author":{"name":"Davis
Plumlee","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-02-24T14:35:17Z","message":"[Security
Solution] Adds prebuilt rule customization integration tests
(elastic#207016)\n\n## Summary\n\nAdds tests in accordance
to\nhttps://github.com/elastic/pull/204888\n\nAdds integration
tests for the prebuilt rule customization features\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [x] [Unit or
functional\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\nwere
updated or added to match the most common scenarios\n- [x] [Flaky
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(elastic#207016)\n\n## Summary\n\nAdds tests in accordance
to\nhttps://github.com/elastic/pull/204888\n\nAdds integration
tests for the prebuilt rule customization features\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [x] [Unit or
functional\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\nwere
updated or added to match the most common scenarios\n- [x] [Flaky
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x100:\nhttps://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/7919\n-
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[Security Solution] Adds prebuilt rule customization integration tests
(elastic#207016) (elastic#212253)\n\n# Backport\n\nThis will backport the following
commits from `main` to `9.0`:\n- [[Security Solution] Adds prebuilt rule
customization integration\ntests
(elastic#207016)](https://github.com/elastic/kibana/pull/207016)\n\n\n\n###
Questions ?\nPlease refer to the [Backport
tool\ndocumentation](https://github.com/sorenlouv/backport)\n\n\n\nCo-authored-by:
Davis Plumlee
<[email protected]>"}},{"branch":"8.18","label":"v8.18.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v9.1.0","branchLabelMappingKey":"^v9.1.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/207016","number":207016,"mergeCommit":{"message":"[Security
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to\nhttps://github.com/elastic/pull/204888\n\nAdds integration
tests for the prebuilt rule customization features\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [x] [Unit or
functional\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\nwere
updated or added to match the most common scenarios\n- [x] [Flaky
Test\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\nused on any tests changed\n- [x] 🟢 ESS
x100:\nhttps://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/7919\n-
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[x] 🟡 Serverless
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Elastic Machine
<[email protected]>","sha":"a51e96eae2904aa3488af1037d87d83beec2cd0d"}},{"branch":"8.x","label":"v8.19.0","branchLabelMappingKey":"^v8.19.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

x-pack/test/security_solution_api_integration/test_suites/detections_response/rules_management/prebuilt_rules/prebuilt_rule_customization/customization_enabled/index.ts

@@ -12,6 +12,7 @@ export default ({ loadTestFile }: FtrProviderContext): void => {
     loadTestFile(require.resolve('./is_customized_calculation'));
     loadTestFile(require.resolve('./import_rules'));
     loadTestFile(require.resolve('./rules_export'));
+    loadTestFile(require.resolve('./rule_customization'));
     loadTestFile(require.resolve('./preview_prebuilt_rules_upgrade'));
     loadTestFile(require.resolve('./upgrade_prebuilt_rules'));
   });