Simplify tests by using GinkgoT().TempDir()

[alexandear]

The PR refactors tests by replacing os.MkdirTemp with GinkgoT().TempDir().

T.TempDir returns a temporary directory for the test to use. The directory is automatically removed when the test and all its subtests complete.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.66%. Comparing base (1216c9b) to head (ddb62cd).
Report is 18 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1265      +/-   ##
==========================================
- Coverage   68.49%   66.66%   -1.84%     
==========================================
  Files          75       75              
  Lines        4384     5186     +802     
==========================================
+ Hits         3003     3457     +454     
- Misses       1233     1581     +348     
  Partials      148      148              

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