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 93.37%. Comparing base (9b6ae6f) to head (191a9a3).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2040   +/-   ##
=======================================
  Coverage   93.36%   93.37%           
=======================================
  Files         179      179           
  Lines       12488    12488           
=======================================
+ Hits        11660    11661    +1     
+ Misses        828      827    -1     

Flag	Coverage Δ
unit	93.37% <ø> (+<0.01%)	⬆️

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