Disable overlay status check for CS config test workflow

[mbg]

This workflow is currently failing, because #3487 is enabled for this repo and a build on main failed. We can delete the cache to unblock the workflow, but would then have the same problem next time a CodeQL analysis fails on main.

Risk assessment

For internal use only. Please select the risk level of this change:

• Low risk: Changes are fully under feature flags, or have been fully tested and validated in pre-production environments and are highly observable, or are documentation or test only.

Which use cases does this change impact?

Environments:

• Testing/None - This change does not impact any CodeQL workflows in production.

How did/will you validate this change?

• End-to-end tests - I am depending on PR checks (i.e. tests in pr-checks).

If something goes wrong after this change is released, what are the mitigation and rollback strategies?

• Rollback - Change can only be disabled by rolling back the release or releasing a new version with a fix.

How will you know if something goes wrong after this change is released?

N/A

Are there any special considerations for merging or releasing this change?

• No special considerations - This change can be merged at any time.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Consider adding a changelog entry for this change.
• Confirm the readme and docs have been updated if necessary.

[Copilot]

Pull request overview

This PR disables the OverlayAnalysisStatusCheck feature flag for the Code Scanning config CLI test workflow. PR #3487 introduced caching of overlay analysis failures, which caused this test workflow to skip overlay analysis when a main-branch build had previously failed. Setting CODEQL_ACTION_OVERLAY_ANALYSIS_STATUS_CHECK: false prevents the cached failure status from affecting this test workflow, ensuring stable test results independent of transient main-branch build failures.

Changes:

• Adds CODEQL_ACTION_OVERLAY_ANALYSIS_STATUS_CHECK: false as a workflow-level env var to disable the overlay status check feature for the CS config test workflow.

[henrymercer]

Thanks, and good idea re adding JSDoc to Features