fix: change error to warning for build platform mismatch with cluster node platform

[gsquared94]

Fixes: #7355

Description

minikube and docker-desktop on Apple M1 report their cluster node types as linux/arm64 but they can run linux/amd64 images using qemu binfmt_misc extensions. So we change this error condition to a warning message instead.
User facing changes (remove if N/A)

Users can force build for specific platforms using --platform flag even if it doesn't match the kubernetes cluster node types.

Follow up Work

Cherrypick this to v1 branch before v1.39.0 release.

[codecov]

Codecov Report

Merging #7402 (288e29b) into main (290280e) will decrease coverage by 3.86%.
The diff coverage is 55.51%.

@@            Coverage Diff             @@
##             main    #7402      +/-   ##
==========================================
- Coverage   70.48%   66.62%   -3.87%     
==========================================
  Files         515      566      +51     
  Lines       23150    27150    +4000     
==========================================
+ Hits        16317    18088    +1771     
- Misses       5776     7761    +1985     
- Partials     1057     1301     +244     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	50.00% <0.00%> (-3.85%)	⬇️
cmd/skaffold/app/cmd/test.go	44.44% <0.00%> (ø)
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/render.go	36.66% <12.50%> (-4.72%)	⬇️
cmd/skaffold/app/cmd/inspect_tests.go	62.50% <14.28%> (-1.14%)	⬇️
cmd/skaffold/app/cmd/lsp.go	28.12% <28.12%> (ø)
cmd/skaffold/app/cmd/fix.go	55.93% <38.88%> (-20.54%)	⬇️
cmd/skaffold/app/cmd/verify.go	41.17% <41.17%> (ø)
cmd/skaffold/app/cmd/lint.go	42.85% <42.85%> (ø)
... and 294 more

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