[CI] Missing PR Auto-Labeler Configuration

[shinigami-777]

Current Behavior

The PR auto-labeler is currently not working because the necessary configurations are missing.

Desired Behavior

Implementation

Acceptance Tests

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Contributor Guides and Resources

• 📝 Meshery Adapters Spreadsheet
• 🛠 Meshery Build & Release Strategy
• 🙋🏾🙋🏼 Questions: Layer5 Discussion Forum and Layer5 Community Slack

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