Add workflow for branch age notification

[santoshyadavdev]

Adds a new GitHub Actions workflow to send notifications for branches older than 180 days.

• Workflow Configuration: Introduces a new file .github/workflows/branch-notification.yml named 'Branch Age Notification'.
• Schedule Trigger: Configures the workflow to run weekly, specifically every Friday at 12pm CET.
• Branch Age Check Job: Adds a job that checks for branches older than 180 days using actions/github-script@v6.
• Notification Logic Placeholder: Includes a placeholder for adding notification logic for branches identified as older than 180 days.

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