Specifying artifact location i.e locally or remote

[prary]

Relates to #2950

Description
Location of cached image i.e local or remote
User facing changes

yes

Before

DEBU[0000] Found dependencies for dockerfile: [{app.py / true}]
 - .........../test/artifact/py: Found 

After

DEBU[0000] Found dependencies for dockerfile: [{app.py / true}]
 - .........../test/artifact/py: Found remotely

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.

[codecov]

Codecov Report

Merging #2958 into master will increase coverage by <.01%.
The diff coverage is 100%.

Impacted Files	Coverage Δ
pkg/skaffold/build/cache/retrieve.go	64.63% <100%> (+1.34%)	⬆️

[priyawadhwa]

Hey @prary thanks for submitting this! I think we can simplify this considerably be removing the Location from the cacheDetails interface and using imagesFoundLocally as described in my comment.