Determine CodeQL version from feature flags on GHEC-DR

[henrymercer]

This lets us roll back a bad version of CodeQL more quickly in GitHub Enterprise Cloud with data residency.

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, CCR, ...).

Products:

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

Environments:

• GHEC-DR

How did/will you validate this change?

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

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.
  • Dashboards - I will watch relevant dashboards for issues after the release. Consider whether this requires this change to be released at a particular time rather than as part of a regular release.

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 renames the GitHub variant GHE_DOTCOM to GHEC_DR (GitHub Enterprise Cloud with Data Residency) and enables feature flag support for determining the CodeQL version on GHEC-DR environments. This allows faster rollback of bad CodeQL versions in GHEC-DR by using feature flags, similar to how it works for GitHub.com.

Key Changes

• Renamed GHE_DOTCOM enum variant to GHEC_DR with string values for better clarity
• Enabled feature flag support for GHEC-DR to determine CodeQL CLI versions
• Updated CodeQL source selection logic to be more precise (checking for GHES specifically instead of "not DOTCOM")

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/util.ts	Renamed enum variant from GHE_DOTCOM to GHEC_DR and changed enum values from numeric to string literals
src/util.test.ts	Updated test cases to use renamed GHEC_DR variant
src/setup-codeql.ts	Fixed logic to check for GHES specifically instead of "not DOTCOM", enabling GHEC-DR to use default tooling
src/feature-flags.ts	Added supportsFeatureFlags helper function that includes both DOTCOM and GHEC-DR, enabling feature flags for GHEC-DR
src/feature-flags.test.ts	Renamed test from "Proxima" to "GHEC-DR" and parameterized tests to cover both DOTCOM and GHEC-DR variants
src/database-upload.ts	Updated variant check to use renamed GHEC_DR constant
src/api-client.ts	Updated return value to use GHEC_DR when detecting "ghe.com" header
src/api-client.test.ts	Updated test to use GHEC_DR variant name
.github/pull_request_template.md	Updated documentation to clarify that "Dotcom" environment includes GHEC-DR
lib/**/*.js	Auto-generated JavaScript files reflecting TypeScript changes (not reviewed per guidelines)