Add setFiles to HelmDeploy.HelmRelease skaffold config which will be add --set-files argument to helm CLI

[marti1125]

Relates to #2678

Fixes #2678

Description

Add setFiles config to helm deployer and plumb it through to add it helm CLI.

User facing changes
Write n/a if not output or log lines changed and no behavior is changed
n/a

Next PRs.
n/a

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes unit tests
• Mentions any output changes.
• Adds documentation as needed: user docs, YAML reference, CLI reference.
• Adds integration tests if needed.

See the contribution guide for more details.

Double check this list of stuff that's easy to miss:

• If you are adding a example to the examples dir, please copy them to integration/examples
• Every new example added in integration/examples dir, should be tested in integration test

Reviewer Notes

• The code flow looks good.
• Unit test added.
• User facing changes look good.

Release Notes

 Add `setFiles` to `HelmDeploy.HelmRelease` skaffold config which will be add `--set-files` argument to helm CLI

[tejal29]

@marti1125 please run make generate-schemas and add tests by refactoring your lines into another small function and passing latest.HelmRelease with empty, non-empty values.

[codecov]

Codecov Report

Merging #2895 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

Impacted Files	Coverage Δ
pkg/skaffold/schema/latest/config.go	100% <ø> (ø)	⬆️
pkg/skaffold/deploy/helm.go	74.9% <100%> (+0.69%)	⬆️
pkg/skaffold/deploy/resource/deployment.go	94.28% <0%> (-5.72%)	⬇️
pkg/skaffold/deploy/status_check.go	56.48% <0%> (-2.65%)	⬇️
pkg/skaffold/build/custom/custom.go	63.93% <0%> (-1.86%)	⬇️
pkg/skaffold/initializer/init.go	57.45% <0%> (-1.69%)	⬇️
pkg/skaffold/build/cluster/sources/sources.go	90.9% <0%> (-0.68%)	⬇️
pkg/skaffold/jib/jib.go	73.48% <0%> (ø)	⬆️
pkg/skaffold/schema/defaults/defaults.go	91.02% <0%> (ø)	⬆️
pkg/skaffold/deploy/resource/base.go	84.61% <0%> (ø)

[balopat]

seen a minor nit but otherwise okay