Remove nested git repository from pipelines tests

[lkingland]

Nested git repositories cause problems with a plethora of tools.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.29%. Comparing base (50215d6) to head (10a1afa).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3628      +/-   ##
==========================================
+ Coverage   55.61%   56.29%   +0.67%     
==========================================
  Files         180      180              
  Lines       20549    20549              
==========================================
+ Hits        11429    11568     +139     
+ Misses       7960     7779     -181     
- Partials     1160     1202      +42     

Flag	Coverage Δ
e2e	36.21% <ø> (ø)
e2e go	32.86% <ø> (?)
e2e node	28.62% <ø> (ø)
e2e python	33.23% <ø> (?)
e2e quarkus	28.76% <ø> (?)
e2e rust	28.18% <ø> (?)
e2e springboot	26.62% <ø> (ø)
e2e typescript	28.73% <ø> (ø)
e2e-config-ci	18.08% <ø> (ø)
integration	17.50% <ø> (+0.03%)	⬆️
unit macos-14	43.35% <ø> (+<0.01%)	⬆️
unit macos-latest	43.35% <ø> (ø)
unit ubuntu-24.04-arm	43.55% <ø> (ø)
unit ubuntu-latest	44.23% <ø> (ø)
unit windows-latest	43.38% <ø> (ø)

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[gauron99]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99, lkingland

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