Convert update-supported-enterprise-server-versions script to TypeScript

[mbg]

Converts the Python code in .github/workflows/update-supported-enterprise-server-versions to TypeScript in pr-checks.

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?

• 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?

• Development/testing only - This change cannot cause any failures in production.

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

• Other - Please provide details.

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 replaces the existing Python automation under .github/workflows/update-supported-enterprise-server-versions/ with a TypeScript implementation under pr-checks/, and updates the scheduled workflow to run the new script via Node/tsx.

Changes:

• Add pr-checks/update-ghes-versions.ts (plus unit tests) to compute and update src/api-compatibility.json from an enterprise-releases checkout.
• Update .github/workflows/update-supported-enterprise-server-versions.yml to run the TypeScript script (Node 24 + npm ci) instead of Python/pipenv.
• Remove the old Python script and Pipenv files; add semver dependency to the pr-checks workspace (and update the root lockfile).

Show a summary per file

File	Description
pr-checks/update-ghes-versions.ts	New TS implementation for determining supported GHES version range and updating src/api-compatibility.json.
pr-checks/update-ghes-versions.test.ts	Unit tests for the new TS script logic (parsing, date helpers, range selection).
pr-checks/package.json	Adds semver dependency for the new script.
pr-checks/config.ts	Exposes API_COMPATIBILITY_FILE path for use by the new script.
.github/workflows/update-supported-enterprise-server-versions.yml	Switches workflow execution from Python to Node/TypeScript and rebuilds after updating compatibility data.
.github/workflows/update-supported-enterprise-server-versions/update.py	Removes the previous Python implementation.
.github/workflows/update-supported-enterprise-server-versions/Pipfile	Removes Pipenv configuration no longer needed.
.github/workflows/update-supported-enterprise-server-versions/Pipfile.lock	Removes Pipenv lockfile no longer needed.
package-lock.json	Updates workspace dependency graph (including semver resolution).
lib/upload-lib.js	Generated artifact update due to dependency graph changes (not reviewed).
lib/entry-points.js	Generated artifact update due to dependency graph changes (not reviewed).

Copilot's findings

• Files reviewed: 7/11 changed files
• Comments generated: 5