fix: always add namespaces in generated manifests regardless of offline=[true|false]

[aaron-prindle]

fixes #8105

The comment there:

consult with cloud deploy team if namespaces can be set in offline mode
	// in case namespace is set on the skaffold render cli command.

mentioned talking w/ Cloud Deploy team. In a recent discussion w/ the Cloud Deploy team they have stated that the functionality they want here is that namespaces are modified in manifests during skaffold render for both offline=[true|false].

[codecov]

Codecov Report

Merging #8124 (1fe5321) into main (290280e) will decrease coverage by 4.20%.
The diff coverage is 53.26%.

@@            Coverage Diff             @@
##             main    #8124      +/-   ##
==========================================
- Coverage   70.48%   66.28%   -4.21%     
==========================================
  Files         515      599      +84     
  Lines       23150    29347    +6197     
==========================================
+ Hits        16317    19452    +3135     
- Misses       5776     8448    +2672     
- Partials     1057     1447     +390     

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 394 more

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