chore: consolidate CI workflows and improvements

[ChiragAgg5k]

Summary

• Consolidate linter, codeql-analysis, and tests workflows into single ci.yml
• Add getInjections() method to Hook class
• Fix PHPStan analysis by excluding example server files

Changes

• CI Workflow: Merged 3 separate workflows into one with concurrency control, updated to actions/checkout@v4, and added push-to-main trigger
• Hook.php: Added getInjections() getter method for the injections array
• PHPStan: Excluded tests/Servers/servers directory (example files that depend on external packages)

Test plan

• Verify CI workflow runs lint, analyze, and tests jobs
• Verify PHPStan passes without errors

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore-improvements

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