Test lock updates

[samschott]

• Fix an issue with the test lock being deleted in cleanup before test case.
• Simplify pytest fixtures.
• Aquire lock on per-session instead of per-test-case.
• Aquire lock for a max timeout of 10 min and renew for another 10 min for each test case.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.03%. Comparing base (7666b12) to head (1e58da3).
Report is 45 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1051       +/-   ##
===========================================
+ Coverage   55.86%   79.03%   +23.17%     
===========================================
  Files          42       42               
  Lines        7551     7551               
===========================================
+ Hits         4218     5968     +1750     
+ Misses       3333     1583     -1750     

Flag	Coverage Δ
pytest	79.03% <ø> (+23.17%)	⬆️

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