fix failing tests due to using cookie maxage 0 for deletion

[tusharpandey13]

This PR fixes a failing test which checks if it's deleted by checking if expiry time is unix epoch 0. We use max-age=0 since #2200 so this should be checked instead.
This was not caught in #2200 bc the branch was not updated with main (github showed that there were no changed files b/w pr and main but testing strategy was changed)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.23%. Comparing base (268688d) to head (fbe91b7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2215      +/-   ##
==========================================
+ Coverage   84.20%   84.23%   +0.03%     
==========================================
  Files          22       22              
  Lines        2203     2208       +5     
  Branches      396      397       +1     
==========================================
+ Hits         1855     1860       +5     
  Misses        342      342              
  Partials        6        6              

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