feat: standarize renders to inject namespace only if --namespace or render specific config is set

[renzodavid9]

Fixes: #8318

Description
This PR will make the existing renderers to only inject a metadata.namespace field if a --namespace flag is set or if the render itself is configured for that.

Pending
Validate helm behavior

[codecov]

Codecov Report

Merging #8561 (eaf767d) into main (290280e) will decrease coverage by 6.25%.
The diff coverage is 54.47%.

@@            Coverage Diff             @@
##             main    #8561      +/-   ##
==========================================
- Coverage   70.48%   64.24%   -6.25%     
==========================================
  Files         515      613      +98     
  Lines       23150    30711    +7561     
==========================================
+ Hits        16317    19729    +3412     
- Misses       5776     9504    +3728     
- Partials     1057     1478     +421     

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 39 more

... and 393 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[aaron-prindle]

LGTM!