Clean up codeql.resolveLanguages

[henrymercer]

Only the betterjson option is now used, so remove the old version.

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?

Workflow types:

• Advanced setup - Impacts users who have custom CodeQL workflows.
• Managed - Impacts users with dynamic workflows (Default Setup, Code Quality, ...).

Products:

• Code Scanning - The changes impact analyses when analysis-kinds: code-scanning.
• Code Quality - The changes impact analyses when analysis-kinds: code-quality.
• Other first-party - The changes impact other first-party analyses.

Environments:

• Dotcom - Impacts CodeQL workflows on github.com and/or GitHub Enterprise Cloud with Data Residency.
• GHES - Impacts CodeQL workflows on GitHub Enterprise Server.

How did/will you validate this change?

• Unit tests - I am depending on unit test coverage (i.e. tests in .test.ts files).
• 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?

• Telemetry - I rely on existing telemetry or have made changes to the telemetry.
  • Alerts - New or existing monitors will trip if something goes wrong with this change.

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 cleans up the CodeQL CLI language-resolution API by removing the legacy betterResolveLanguages method and standardizing on a single resolveLanguages implementation that uses the --format=betterjson output.

Changes:

• Replace all call sites of betterResolveLanguages() with resolveLanguages().
• Update stubs/mocks in unit tests to align with the new resolveLanguages method name and output expectations.
• Simplify the CodeQL interface by removing the old JSON-format resolveLanguages variant and keeping only the betterjson-based behavior.

Show a summary per file

File	Description
src/workflow.ts	Switch language alias resolution to call codeql.resolveLanguages().
src/workflow.test.ts	Update stubbing to match the renamed resolveLanguages() API.
src/trap-caching.ts	Use resolveLanguages() to query extractor metadata for TRAP caching support.
src/trap-caching.test.ts	Update stubbed CodeQL implementation to provide resolveLanguages().
src/config-utils.ts	Use resolveLanguages({ filterToLanguagesWithQueries }) for supported language detection.
src/config-utils.test.ts	Update stub implementations and expectations for resolveLanguages() output.
src/codeql.ts	Remove the old JSON resolveLanguages method and rename betterjson variant to resolveLanguages.
lib/entry-points.js	Generated output updated to reflect the TypeScript changes (not reviewed).

Copilot's findings

• Files reviewed: 7/8 changed files
• Comments generated: 1