Run PR checks over CodeQL v2.22 release series

[henrymercer]

This release series is now complete, so add it to our testing matrix.

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.

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 adds CodeQL v2.22.4 to the testing matrix for PR checks, marking the completion of the v2.22 release series.

• Adds stable-v2.22.4 to the default test versions in the sync script
• Updates generated workflow files to include the new version in test matrices
• Removes unused imports from the sync script

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pr-checks/sync.py	Adds v2.22.4 to test versions and removes unused imports
.github/workflows/__multi-language-autodetect.yml	Generated file with v2.22.4 added to test matrix
.github/workflows/__go-tracing-legacy-workflow.yml	Generated file with v2.22.4 added to test matrix
.github/workflows/__go-tracing-custom-build-steps.yml	Generated file with v2.22.4 added to test matrix
.github/workflows/__go-tracing-autobuilder.yml	Generated file with v2.22.4 added to test matrix