🐛 Fix error on large uploads and lacking progress print for gcsfs

[Koncopd]

Related laminlabs/lamindb-setup#1375

Fixes an indefinite hang in cloud transfers on jupyter notebooks, where an upload or download would freeze while asyncio logged AssertionError: Data should not be empty from _SelectorSocketTransport._write_send around 100k times per second.

Both symptoms are one event: when the backend closes a connection mid-request, asyncio can be left with a socket writer registered for an empty write buffer, and _write_send asserts before it reaches the code that would unregister it, so the loop re-runs the failing callback forever and starves every other transfer sharing the fsspec IO loop.

The new lamindb_setup/core/_asyncio_write_spin.py installs an exception handler that unregisters the stuck writer and aborts the transport, so the interrupted request fails like a normal dropped connection and the backend retries it. It only touches selector loops and this one assertion, so everything else is unaffected.

Reported without a diagnosis in fsspec/gcsfs#604 and fsspec/s3fs#909; a surviving variant of python/cpython#115514 that still reproduces on 3.13.12.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.99%. Comparing base (43a1701) to head (6a3f5f5).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3832      +/-   ##
==========================================
- Coverage   91.52%   86.99%   -4.53%     
==========================================
  Files          88       88              
  Lines       15723    15734      +11     
==========================================
- Hits        14390    13688     -702     
- Misses       1333     2046     +713     

Files with missing lines	Coverage Δ
lamindb/models/artifact.py	91.88% <100.00%> (-1.76%)	⬇️

... and 14 files with indirect coverage changes

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[github-actions]

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