Cleanup tinkerbell test resources before every test run

[g-gaston]

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[codecov]

Codecov Report

Attention: Patch coverage is 45.00000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 73.46%. Comparing base (19ffd41) to head (3e9c9a9).
Report is 2 commits behind head on main.

Files	Patch %	Lines
pkg/executables/govc.go	45.00%	9 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8442      +/-   ##
==========================================
- Coverage   73.48%   73.46%   -0.02%     
==========================================
  Files         578      578              
  Lines       36489    36507      +18     
==========================================
+ Hits        26814    26821       +7     
- Misses       7956     7965       +9     
- Partials     1719     1721       +2     

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