test: deflake Playwright navigation tests hitting ERR_NO_BUFFER_SPACE on Windows CI

[vdusek]

Two Playwright crawler tests set max_request_retries=0 and assert that navigation succeeds. On the Windows CI runners under pytest-xdist load, Chromium navigation intermittently fails with net::ERR_NO_BUFFER_SPACE (socket-buffer exhaustion). With retries disabled, a single such spurious failure aborted the run and failed the assertions (this is what broke on the reported CI run).

Dropping max_request_retries=0 (falling back to the default of 3) lets a spurious navigation failure recover on retry, matching how the neighbouring tests already survive. The assertions are unchanged and still meaningful:

• test_respect_robots_txt_with_problematic_links — budplaceholder.com still reaches the failed-request handler once its retries are exhausted.
• test_slow_navigation_does_not_count_toward_handler_timeout — a single successful attempt still yields the asserted counts.

The failure-asserting tests that intentionally rely on max_request_retries=0 (test_navigation_timeout_on_slow_page_load, test_navigation_timeout_applies_to_hooks, and the adaptive static-timeout test) were left unchanged, since enabling retries there would change their semantics rather than help.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.36%. Comparing base (9b6ae6f) to head (eddc4dd).
⚠️ Report is 22 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2040      +/-   ##
==========================================
- Coverage   93.36%   93.36%   -0.01%     
==========================================
  Files         179      179              
  Lines       12488    12495       +7     
==========================================
+ Hits        11660    11666       +6     
- Misses        828      829       +1     

Flag	Coverage Δ
unit	93.36% <ø> (-0.01%)	⬇️

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