fix: expand namespace with env variables

[renzodavid9]

Fixes: #8183

Description
Now, before returning the namespace from the runcontext, we replace the env variables if any is present.

[codecov]

Codecov Report

Merging #8222 (d6efa0e) into main (290280e) will decrease coverage by 4.35%.
The diff coverage is 53.26%.

@@            Coverage Diff             @@
##             main    #8222      +/-   ##
==========================================
- Coverage   70.48%   66.12%   -4.36%     
==========================================
  Files         515      601      +86     
  Lines       23150    29483    +6333     
==========================================
+ Hits        16317    19497    +3180     
- Misses       5776     8527    +2751     
- Partials     1057     1459     +402     

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 396 more

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[aaron-prindle]

Awesome!! LGTM