fix(upload): gracefully handle Bitbucket unreachable during webhook setup

[sentry]

This PR addresses issue WORKER-YV6, where the Upload task would fail with a TorngitServerUnreachableError when attempting to set up a Bitbucket webhook.

The root cause was identified as a httpx.ConnectTimeout (wrapped as TorngitServerUnreachableError) occurring during the POST request to Bitbucket's API for webhook registration. This error was not being caught by the existing except TorngitClientError block in possibly_setup_webhooks because TorngitServerUnreachableError inherits from TorngitServerFailureError, not TorngitClientError.

Since webhook registration is a non-critical side-effect of the upload process, a transient network issue preventing its completion should not cause the entire upload task to fail. This fix modifies the possibly_setup_webhooks function to explicitly catch TorngitServerUnreachableError. When caught, it logs a warning with the exception details and allows the upload task to continue processing, ensuring that coverage reports are not blocked by temporary API unreachability.

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Fixes WORKER-YV6

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.88%. Comparing base (e682d07) to head (d2f04f6).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/tasks/upload.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1236      +/-   ##
==========================================
- Coverage   91.89%   91.88%   -0.01%     
==========================================
  Files        1325     1325              
  Lines       50868    50870       +2     
  Branches     1626     1626              
==========================================
  Hits        46744    46744              
- Misses       3818     3820       +2     
  Partials      306      306              

Flag	Coverage Δ
workerintegration	58.55% <33.33%> (-0.01%)	⬇️
workerunit	90.36% <33.33%> (-0.02%)	⬇️

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Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/tasks/upload.py	33.33%	2 Missing ⚠️

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