move profile verification higher up the stack

[gsquared94]

Related: #5707
Implements #5755 (comment)
Description

Currently the profile selection (--profile or -p flag values) is being validated for each config. In #5707 we want to allow specifying profile names that are found in a nested modules layout. So it can't be validated for every file, but rather at the end after all files have been processed.

[codecov]

Codecov Report

Merging #5779 (2584d51) into master (d14f34d) will decrease coverage by 0.02%.
The diff coverage is 76.31%.

@@            Coverage Diff             @@
##           master    #5779      +/-   ##
==========================================
- Coverage   70.78%   70.76%   -0.03%     
==========================================
  Files         432      433       +1     
  Lines       16242    16278      +36     
==========================================
+ Hits        11497    11519      +22     
- Misses       3901     3910       +9     
- Partials      844      849       +5     

Impacted Files	Coverage Δ
pkg/skaffold/build/jib/init.go	83.05% <0.00%> (-4.45%)	⬇️
pkg/skaffold/build/jib/jib.go	69.46% <0.00%> (-1.08%)	⬇️
pkg/skaffold/build/jib/jvm.go	55.55% <55.55%> (ø)
pkg/skaffold/parser/config.go	79.56% <100.00%> (-0.13%)	⬇️
pkg/skaffold/schema/errors/errors.go	100.00% <100.00%> (ø)
pkg/skaffold/schema/profiles.go	88.46% <100.00%> (-1.15%)	⬇️
pkg/skaffold/docker/image.go	78.34% <0.00%> (-1.39%)	⬇️
pkg/skaffold/docker/parse.go	86.19% <0.00%> (-0.96%)	⬇️
... and 2 more

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