Refactor metrics prompt functions and change color package name

[MarlonGamez]

Related: #5370
Description
Refactor to move pkg/skaffold/instrumentation/ prompt functions into pkg/skaffold/instrumentation/prompt/, and rename the color package to output. This package will be added upon in an upcoming PR

[codecov]

Codecov Report

Merging #5890 (0d1309a) into master (ff5038a) will not change coverage.
The diff coverage is 63.39%.

@@           Coverage Diff           @@
##           master    #5890   +/-   ##
=======================================
  Coverage   70.91%   70.91%           
=======================================
  Files         447      447           
  Lines       16908    16908           
=======================================
  Hits        11990    11990           
  Misses       4028     4028           
  Partials      890      890           

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/diagnose.go	64.51% <0.00%> (ø)
cmd/skaffold/app/cmd/find_configs.go	48.48% <0.00%> (ø)
cmd/skaffold/app/cmd/generate_pipeline.go	61.53% <0.00%> (ø)
cmd/skaffold/app/cmd/runner.go	58.49% <0.00%> (ø)
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
pkg/skaffold/build/bazel/build.go	67.24% <0.00%> (ø)
pkg/skaffold/build/gcb/cloud_build.go	0.00% <0.00%> (ø)
pkg/skaffold/build/local/local.go	61.36% <0.00%> (ø)
pkg/skaffold/build/result.go	83.33% <0.00%> (ø)
pkg/skaffold/deploy/kubectl/kubectl.go	65.18% <0.00%> (ø)
... and 37 more

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[aaron-prindle]

LGTM