test: Squash some transient test error vectors

[rjsparks]

As a short experiment I threw claude at #5834. This PR should improve resiliency against transient errors for the tests that had not already been fixed, except for the transient that issue noted in the Playwright tests which we will handle separately.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.43%. Comparing base (15b2abd) to head (3940e5e).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10730      +/-   ##
==========================================
+ Coverage   88.42%   88.43%   +0.01%     
==========================================
  Files         331      331              
  Lines       44557    44606      +49     
==========================================
+ Hits        39399    39449      +50     
+ Misses       5158     5157       -1     

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