Fix Storage Control endpoint resolution for TPC

[Mahalaxmibejugam]

This PR fixes the endpoint resolution for the Storage Control API in ExtendedGcsFileSystem to support TPC environments correctly.

Changes

• gcsfs/extended_gcsfs.py: Refactored _get_control_plane_client to use self._location for deriving the endpoint, automatically handling universe domains and emulator hosts.
• gcsfs/tests/test_extended_hns_gcsfs.py: Added test_get_control_plane_client_endpoint to cover explicit endpoint, universe domain, emulator, and default fallback scenarios.
• cloudbuild/setup_vm.sh: Added a log to print the fsspec version after installing it from head, to help debug CI issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.95%. Comparing base (e768973) to head (c7f1f7e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #847      +/-   ##
==========================================
- Coverage   88.19%   87.95%   -0.24%     
==========================================
  Files          15       15              
  Lines        2989     2997       +8     
==========================================
  Hits         2636     2636              
- Misses        353      361       +8     

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