chore: change custom actions pull logic, to check if an image exists locally first before triggering a pull

[renzodavid9]

Fixes: #9139

Description
This PR adds a new config field for local custom actions to force the use of a local image if one exists, if it doesn't exists it will trigger a pull.

How to test the change
With the following skaffold.yaml file:

apiVersion: skaffold/v4beta8
kind: Config

customActions:
  - name: my-action
    executionMode:
      local:
        useLocalImages: true
    containers:
      - name: gcloud-task
        image: gcr.io/cloud-builders/gcloud:latest
        command: ["/bin/sh"]
        args: ["-c", "gcloud version"]

Execute skaffold exec my-action. You'll notice that the image is pull from the registry before running the container. Now if you run skaffold exec my-action again, you'll see that Skaffold is not trying to pull the image again from the registry.

Follow-up work
#9148: We'll be adding the same logic for skaffold verify, the schema change affects both, customActions, and verify.

[codecov]

Codecov Report

Merging #9147 (4d30132) into main (290280e) will decrease coverage by 7.13%.
Report is 1048 commits behind head on main.
The diff coverage is 48.33%.

❗ Current head 4d30132 differs from pull request most recent head 183fcba. Consider uploading reports for the commit 183fcba to get more accurate results

@@            Coverage Diff             @@
##             main    #9147      +/-   ##
==========================================
- Coverage   70.48%   63.35%   -7.13%     
==========================================
  Files         515      630     +115     
  Lines       23150    32419    +9269     
==========================================
+ Hits        16317    20540    +4223     
- Misses       5776    10314    +4538     
- Partials     1057     1565     +508     

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 434 files with indirect coverage changes

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[aaron-prindle]

LGTM!