GeezerVison

Merging c050421 into releases/v4.

Conductor for this PR is @henrymercer.

Contains the following pull requests:

• Check for versions of macOS and Xcode that are unsupported for traced analysis #4221 (@mbg)
• Include diagnostics in failed SARIF if they were created before a database was initialised #4223 (@mbg)
• Remove getRunnerLogger #4235 (@mbg)
• Remove TRAP cache cleanup #4243 (@henrymercer)
• Use per-language CodeQL bundles by default #4244 (@henrymercer)
• Graduate overlay-aware CodeQL version selection #4246 (@henrymercer)
• Refactor a few things out of util.ts #4251 (@mbg)
• Add toolcache.ts script for bundle(-from)-toolcache checks #4255 (@mbg)
• Mergeback v4.39.1 refs/heads/releases/v4 into main #4258 (@mario-campos)
• Bump the npm-minor group across 1 directory with 3 updates #4260 (@mbg)
• Bump the actions-minor group across 1 directory with 3 updates #4261 (@mbg)
• Minor improvements to prepare for #4221 #4262 (@mbg)
• Add workflow to comment on a PR when it was dequeued #4263 (@mbg)
• Exclude checks that don't always run from the sync script #4264 (@henrymercer)
• Ping the user who enqueued a PR when it's removed from the merge queue #4265 (@henrymercer)
• Update supported GitHub Enterprise Server versions #4266 (@henrymercer)
• Address ubuntu-26.04-related CI failures #4267 (@mbg)
• Bump undici override to the latest 7.x version #4268 (@mbg)
• Bump the npm-minor group across 1 directory with 3 updates #4269 (@henrymercer)
• Bump actions/download-artifact from 8.0.1 to 8.0.2 in /.github/workflows in the actions-minor group across 1 directory #4270 (@mbg)
• Bump actions/setup-node from 6.4.0 to 7.1.0 in /.github/actions/release-initialise #4271 (@mbg)
• Add typecheck commands #4272 (@mbg)
• Fix "Debug artifacts after failure" PR check not checking any artifacts #4273 (@henrymercer)
• Avoid using -latest runner labels in CI #4275 (@mbg)
• Bump the npm-minor group across 1 directory with 2 updates #4276 (@henrymercer)
• Bump actions/setup-python from 7.0.0 to 7.1.0 in /.github/workflows in the actions-minor group across 1 directory #4277 (@mbg)
• Add xcrun-based fallback for Xcode version detection #4278 (@mbg)
• Run tar from its resolved path when extracting zstd bundles #4281 (@henrymercer)
• Update default bundle to 2.27.4 #4284 (@henrymercer)

Please do the following:

• Ensure the CHANGELOG displays the correct version and date.
• Ensure the CHANGELOG includes all relevant, user-facing changes since the last release.
• Check that there are not any unexpected commits being merged into the releases/v4 branch.
• Ensure the docs team is aware of any documentation changes that need to be released.
• Approve running the full set of PR checks if you have not pushed any changes.
• Approve and merge this PR. Make sure Create a merge commit is selected rather than Squash and merge or Rebase and merge.
• Merge the mergeback PR that will automatically be created once this PR is merged.
• Merge all backport PRs to older release branches, that will automatically be created once this PR is merged.