Add a github action to remove old branches

[YanaXu]

Description

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd]

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[Copilot]

Pull Request Overview

This PR introduces a new GitHub Actions workflow to automatically delete old Daily/Release_* branches older than 30 days, triggered on a schedule and via manual dispatch.

• Adds a clean-branches.yml workflow with daily cron and manual dispatch triggers
• Implements a PowerShell script that lists all branches matching Daily/Release_\d{14}, parses their embedded timestamp, and deletes those older than 30 days
• Uses GH CLI to fetch repository info and perform branch deletions

[isra-fel]

LGTM as long as we clear comments from copilot

[vidai-msft]

LGTM