feat(dash): add retry logic for EasyEngine Dashboard API requests

[mrrobot47]

This pull request adds retry logic to the EasyEngine Dashboard API callback functionality in the Site_Backup_Restore.php helper. The main improvement is that failed HTTP requests due to server-side errors (5xx responses) will now be retried up to three times with a five-minute delay between attempts, increasing the reliability of backup status notifications.

Enhancements to API callback reliability:

• Added a retry mechanism in send_dash_request to automatically retry up to three times when a 5xx server error is encountered, with a five-minute delay between attempts.
• Improved error handling and logging: now logs warnings and debug information for each failed attempt, and provides clearer messages for exhausted retries or other error codes.

[Copilot]

Pull request overview

This pull request adds retry logic with exponential backoff for HTTP requests to the EasyEngine Dashboard API when backup/restore callbacks encounter 5xx server errors. The implementation aims to improve reliability when the dashboard API is temporarily unavailable.

Key Changes:

• Implements a retry mechanism with up to 3 retries for 5xx HTTP errors
• Adds 5-minute delays between retry attempts
• Updates terminology from "EasyDash" to "EasyEngine Dashboard" in user-facing messages

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