Updates the PR issue check to recognize both full GitHub issue URLs and short issue references in the format #123.

Problem

Currently, the skip-issue-check workflow only accepts full GitHub issue URLs like https://github.com/microsoft/vscode-python/issues/123 in PR descriptions. Contributors using the more common short format like #123 would need to add the skip-issue-check label to bypass the check.

Solution

Modified the GitHub Actions script in .github/workflows/pr-file-check.yml to check for both formats:

• Full URLs: https://github.com/microsoft/vscode-python/issues/123 (existing behavior)
• Short references: #123 (new behavior)

The check now passes if either format is found in the PR description.

Changes

• Added regex pattern /#\d+/ to match short issue references
• Updated condition to pass if either format is detected: if (!issueLink && !issueReference)
• Maintains backward compatibility and existing skip-issue-check label behavior

Testing

Verified the updated logic handles all scenarios correctly:

• ✅ Full GitHub URLs (existing)
• ✅ Short format like #123 (new)
• ✅ Both formats in same PR description
• ✅ Multiple short references
• ✅ Skip label behavior unchanged
• ❌ No issue references (correctly fails)
• ❌ Invalid formats like # without numbers (correctly fails)

Fixes #25259.

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