Handle navigation exception within taskblock.execute

[ykeremy]

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:rocket:	This description was created by Ellipsis for commit fe683f611ae5355c066c5986b782f01a90a66f25

Summary:

Added exception handling for navigation errors in TaskBlock.execute to log warnings, update task status, and raise a custom exception.

Key points:

• File Modified: skyvern/forge/sdk/workflow/models/block.py
• Class Modified: TaskBlock
• Method Modified: TaskBlock.execute
• Changes:
  • Added playwright.async_api.Error exception handling.
  • Logs a warning message when navigation to a URL fails.
  • Updates the task status to failed in the database with the failure reason.
  • Raises a custom FailedToNavigateToUrl exception with the URL and error message.

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