generate v2 proto go files

[MarlonGamez]

Related: #5368, #5422, #5423

Description
Updates dockerfile to generate v2 proto go files for use in skaffold code, as well as related proto file scripts.
Most of the delta is generated files.

**Follow-up Work

• generate docs files: This is already being done I'm just not copying them into the repo yet as the feature is still under development
• start emitting these protos: This is my next immediate goal.

[codecov]

Codecov Report

Merging #5546 (d8c6f69) into master (f241521) will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5546      +/-   ##
==========================================
- Coverage   71.39%   71.29%   -0.11%     
==========================================
  Files         400      400              
  Lines       14839    14877      +38     
==========================================
+ Hits        10594    10606      +12     
- Misses       3473     3492      +19     
- Partials      772      779       +7     

Impacted Files	Coverage Δ
pkg/skaffold/docker/image.go	78.13% <0.00%> (-1.40%)	⬇️
pkg/skaffold/test/custom/error.go	6.66% <0.00%> (-0.93%)	⬇️
pkg/skaffold/test/custom/custom.go	56.17% <0.00%> (-0.28%)	⬇️

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