chore: re-enable TestBuildKanikoInsecureRegistry gcp test

[ericzzzzzzz]

Fixes: #7121
Related: Relevant tracking issues, for context
Merge before/after: Dependent or prerequisite PRs

Description

User facing changes (remove if N/A)

Follow-up Work (remove if N/A)

[codecov]

Codecov Report

Merging #8196 (72d2e6d) into main (290280e) will decrease coverage by 4.35%.
The diff coverage is 53.26%.

❗ Current head 72d2e6d differs from pull request most recent head aee6590. Consider uploading reports for the commit aee6590 to get more accurate results

@@            Coverage Diff             @@
##             main    #8196      +/-   ##
==========================================
- Coverage   70.48%   66.12%   -4.36%     
==========================================
  Files         515      601      +86     
  Lines       23150    29433    +6283     
==========================================
+ Hits        16317    19463    +3146     
- Misses       5776     8509    +2733     
- Partials     1057     1461     +404     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/test.go	44.44% <0.00%> (ø)
cmd/skaffold/app/exitcode.go	100.00% <ø> (+6.66%)	⬆️
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/inspect_tests.go	62.50% <14.28%> (-1.14%)	⬇️
cmd/skaffold/app/cmd/render.go	35.48% <18.18%> (-5.90%)	⬇️
cmd/skaffold/app/cmd/lsp.go	28.12% <28.12%> (ø)
cmd/skaffold/app/cmd/run.go	64.28% <33.33%> (-9.63%)	⬇️
... and 395 more

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[aaron-prindle]

LGTM!