[Security Solution] Makes `rule_source` a required field in `RuleResponse`

[dplumlee]

Resolves https://github.com/elastic/kibana/issues/180270

Summary

Sets rule_source to be a required field in the RuleResponse type

Checklist

Delete any items that are not applicable to this PR.

• [ ] Documentation was added for features that require explanation or tutorials
• [x] Unit or functional tests were updated or added to match the most common scenarios

For maintainers

• [ ] This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

Pinging @elastic/security-detections-response (Team:Detections and Resp)

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[elasticmachine]

Pinging @elastic/security-detection-rule-management (Team:Detection Rule Management)

[banderror]

@maximpn @dplumlee FYI this PR interferes with https://github.com/elastic/kibana/pull/194132 - when one of them gets merged first, the other one will need to be rebased on top to make sure output OAS bundles are properly regenerated

[dplumlee]

@elasticmachine merge upstream

[dplumlee]

@elasticmachine merge upstream

[banderror]

@elasticmachine merge upstream

[dplumlee]

@elasticmachine merge upstream

[kibana-ci]

:yellow_heart: Build succeeded, but was flaky

• Buildkite Build
• Commit: f258e365b6d5fd6163efe86f472bc2e91500f63b

Failed CI Steps

• Jest Integration Tests #2

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
securitySolution	20.6MB	20.6MB	-41.0B

History

• :yellow_heart: Build #239796 was flaky d4f2b6b4c80203524d8de73d0032dae0d6f5b00a
• :green_heart: Build #239596 succeeded 9437484c90bd18b6b85e1592912c8385d02096ea
• :broken_heart: Build #239569 failed 68e85e2dbf68a20430583be89a081e73e3b65535
• :yellow_heart: Build #239256 was flaky b8c825290489bbf645da62124b82424c2a353eb2
• :yellow_heart: Build #237119 was flaky 552d5f3a4a733570657b463200d857e28b1cffc2
• :broken_heart: Build #236805 failed c273fbee6fc881cc51f474f998ffbd1247cbf3ba

To update your PR or re-run it, just comment with: @elasticmachine merge upstream

cc @dplumlee

[kibanamachine]

Starting backport for target branches: 8.x

https://github.com/elastic/kibana/actions/runs/11221182473

[kibanamachine]

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Status	Branch	Result
✅	8.x

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