fix(browsers): Retry the temp directory removal until the browser releases its files

[vdusek]

PlaywrightPersistentBrowser.close() removed the temp profile directory with one shutil.rmtree(ignore_errors=True) call. On Windows the browser can still hold files there, so the directory leaked silently. The removal now retries (50 × 100 ms) and logs a warning if it never succeeds. close() and the context's close listener both trigger it; a lock makes it run once, and close() waits until it finishes.

Fixes the flaky test_delete_temp_folder_with_close_browser on windows-latest (run 35085779018, run 35991074349).

The crawler state fixes moved to #2255.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.74%. Comparing base (45bb0e2) to head (b0f8dad).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2239      +/-   ##
==========================================
- Coverage   93.74%   93.74%   -0.01%     
==========================================
  Files         181      181              
  Lines       12884    12897      +13     
==========================================
+ Hits        12078    12090      +12     
- Misses        806      807       +1     

Flag	Coverage Δ
unit	93.74% <100.00%> (-0.01%)	⬇️

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