fix: Add integration tests for helm namespace

[linjingsde]

Fixes: #8483

Description
Added integration tests related to namespaces (esp. helm release namespace setting) and v1 -> v2 schema upgrade that would expressly have caught #8185

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot
https://conventionalcommits.org/

[codecov]

Codecov Report

Merging #8965 (4e6be7b) into main (290280e) will decrease coverage by 6.87%.
The diff coverage is 48.91%.

@@            Coverage Diff             @@
##             main    #8965      +/-   ##
==========================================
- Coverage   70.48%   63.62%   -6.87%     
==========================================
  Files         515      624     +109     
  Lines       23150    31932    +8782     
==========================================
+ Hits        16317    20316    +3999     
- Misses       5776    10085    +4309     
- Partials     1057     1531     +474     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
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/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <ø> (ø)
... and 40 more

... and 415 files with indirect coverage changes

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