Add/fix remoteChart tests

[briandealwis]

Related: #5887

Description
In fixing #5887, I realized we don't have tests for deploy with remoteCharts. The existing deploy test for a remote-chart is a vestige of the original skipBuildDependencies being used for remote charts, and doesn't actually seem to be a remote chart. I think?

[codecov]

Codecov Report

Merging #5921 (843f4e2) into master (0549530) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5921      +/-   ##
==========================================
+ Coverage   70.90%   70.92%   +0.01%     
==========================================
  Files         448      448              
  Lines       16968    16968              
==========================================
+ Hits        12032    12035       +3     
+ Misses       4038     4036       -2     
+ Partials      898      897       -1     

Impacted Files	Coverage Δ
pkg/skaffold/docker/image.go	78.34% <0.00%> (-1.39%)	⬇️
pkg/skaffold/docker/parse.go	86.19% <0.00%> (-0.96%)	⬇️
pkg/skaffold/server/server.go	41.96% <0.00%> (ø)
pkg/skaffold/deploy/helm/deploy.go	77.52% <0.00%> (+0.91%)	⬆️
pkg/skaffold/deploy/helm/args.go	81.13% <0.00%> (+1.88%)	⬆️
pkg/skaffold/util/tar.go	56.00% <0.00%> (+5.33%)	⬆️

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