fix: edit original file if the given skaffold path is a symlink

[alphanota]

Fixes: #8489
Related: Relevant tracking issues, for context
Merge before/after: Dependent or prerequisite PRs

Description

This PR fixes issue where skaffold fix --overwrite command doesn't overwrite the contents of a symlink

First we make a backup of original file by copying the contents of symlink to new file (in same directory as symlink, if applicable)

Then we overwrite config file with new contents

This also accounts for case where symlink of symlink is provided.

User facing changes (remove if N/A)

Setup:
$ $HOME/skaffold/out/skaffold fix --overwrite
Backed up previous skaffold.yaml at skaffold.yaml.v2
New config at version skaffold/v4beta6 generated and written to skaffold.yaml

[renzodavid9]

Hey @alphanota, thanks for the PR. Could you please change the PR's title and the commit message to follow the conventionalcommits.org? We have a linter that checks that. Something like the following will work:

fix: edit original file if the given skaffold path is a symlink

Thanks!

[codecov]

Codecov Report

Merging #8955 (20e1494) into main (290280e) will decrease coverage by 6.83%.
The diff coverage is 49.80%.

@@            Coverage Diff             @@
##             main    #8955      +/-   ##
==========================================
- Coverage   70.48%   63.66%   -6.83%     
==========================================
  Files         515      624     +109     
  Lines       23150    31926    +8776     
==========================================
+ Hits        16317    20325    +4008     
- Misses       5776    10076    +4300     
- Partials     1057     1525     +468     

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 40 more

... and 415 files with indirect coverage changes

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

[renzodavid9]

LGTM, let's wait for the tests to finish before merging this. Thanks!