feat: Support post-renderer for helm deployer.

[ericzzzzzzz]

Fixes: #8063, #6951, #6707

• support user-defined post-renderer for helm deployer
  • Skaffold uses post-renderer to set up labels, perform image replacement, and adding debugging annotations when deploying with helm
  • The post-renderer flag provided by helm only supports one executable that allows users to customize their deploy manifests after helm rendering, and if multiples are specified, last writer wins, this behavior makes skaffold override writes user-defined post-rendered
  • This pr changes this by wrapping user-defined post-renderer into skaffold filter.
  • The implementation parses --post-renderer from helm install flags defined in skaffold.yaml without any validation, this is the same as the old behavior.

[codecov]

Codecov Report

Merging #9100 (02d4f89) into main (290280e) will decrease coverage by 7.06%.
Report is 1033 commits behind head on main.
The diff coverage is 48.33%.

❗ Current head 02d4f89 differs from pull request most recent head 3a8d6d9. Consider uploading reports for the commit 3a8d6d9 to get more accurate results

@@            Coverage Diff             @@
##             main    #9100      +/-   ##
==========================================
- Coverage   70.48%   63.43%   -7.06%     
==========================================
  Files         515      628     +113     
  Lines       23150    32331    +9181     
==========================================
+ Hits        16317    20508    +4191     
- Misses       5776    10262    +4486     
- Partials     1057     1561     +504     

Files	Coverage Δ
cmd/skaffold/app/cmd/commands.go	97.61% <100.00%> (+0.35%)	⬆️
cmd/skaffold/app/cmd/config.go	100.00% <100.00%> (ø)
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/debug.go	100.00% <100.00%> (ø)
cmd/skaffold/app/cmd/flags.go	93.00% <100.00%> (+2.18%)	⬆️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/init.go	100.00% <100.00%> (ø)
... and 41 more

... and 432 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more