feat: add template support for chartPath

[aniskhan001]

Fixes: #8626

Description
The skaffold render command doesn't support templating on chartPath field at the moment.
This PR attempts to enable templating on chartPath field.

I have added a basic unit test, please review it and let me know if I need to add/adjust something there.

User facing changes
We would get the following error when there is a template/environment variable

std out err: %!(EXTRA *errors.errorString=Error: repo kubernetes not found
exit status 1
)

With this PR, template/environment variables should render successfully.

[codecov]

Codecov Report

Merging #8645 (0af4ac7) into main (290280e) will decrease coverage by 6.33%.
The diff coverage is 54.47%.

@@            Coverage Diff             @@
##             main    #8645      +/-   ##
==========================================
- Coverage   70.48%   64.15%   -6.33%     
==========================================
  Files         515      615     +100     
  Lines       23150    30796    +7646     
==========================================
+ Hits        16317    19758    +3441     
- Misses       5776     9556    +3780     
- Partials     1057     1482     +425     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
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/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <ø> (ø)
... and 39 more

... and 395 files with indirect coverage changes

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[aaron-prindle]

@aniskhan001 thanks for the PR here! LGTM

I will update the page here:
https://skaffold.dev/docs/environment/templating/

as well to include this information in a separate PR. Thanks again!