Add GitHub Action to delete stale branches

[santoshyadavdev]

This pull request introduces a new GitHub Action to automatically delete stale branches in the uiuniversal/ngu-carousel repository.

• Schedules the action to run every Friday at 12 pm CET, ensuring that the repository maintenance does not interfere with the regular workflow during the weekdays.
• Targets branches older than 100 days for deletion, helping to keep the repository clean and manageable by removing outdated and potentially obsolete branches.
• Excludes critical branches such as master, main, and develop from being deleted, safeguarding the main lines of development from accidental removal.
• Utilizes the latest version of GitHub Actions and the dev-drprasad/delete-older-branches@v0.3.1 action for efficient and reliable branch deletion.

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