Add reusable get-changed-files action and refactor existing actions by TravisEz13 · Pull Request #26355 · PowerShell/PowerShell

- Create new .github/actions/infrastructure/get-changed-files composite action
  - Supports both pull_request and push events
  - Optional filtering by file pattern (e.g., '*.md', '.github/')
  - Full pagination support (fetches all changed files, not just first 100)
  - Returns JSON array of file paths for easy consumption

- Refactor markdownlinks action to use get-changed-files
  - Reduced from 108 lines to 77 lines (29% reduction)
  - Eliminated 31 lines of duplicate file retrieval code
  - Uses secure environment variable instead of direct string interpolation

- Refactor path-filters action to use get-changed-files
  - Reduced from 130 lines to 123 lines
  - Eliminated 15+ lines of duplicate pagination logic
  - Fixed JSON security issue: now uses fromJSON() instead of unsafe JSON.parse()
  - Added detailed logging for filter analysis
  - Proper escaping prevents potential code injection from filenames

Benefits:
- Eliminates ~60 lines of duplicate code across actions
- Centralizes file retrieval logic in one place
- Improves security with proper JSON handling
- Ensures consistent behavior across all actions using changed files
- Full pagination ensures no files are missed in large PRs

TravisEz13 deleted the refactor/add-reusable-get-changed-files-action branch

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