tests: remove pytest-lazy-fixture

[skshetry]

Since it's no longer being maintained. See TvoroG/pytest-lazy-fixture#65.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (44b78b8) 90.43% compared to head (dc1e43f) 90.16%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10294      +/-   ##
==========================================
- Coverage   90.43%   90.16%   -0.27%     
==========================================
  Files         494      494              
  Lines       37811    37815       +4     
  Branches     5468     5468              
==========================================
- Hits        34193    34097      -96     
- Misses       2985     3059      +74     
- Partials      633      659      +26     

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