[images]: refactor prune command

[saehejkang]

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Motivation and Context

Updates to image prune for consistency with how other prune commands are done. Added missing test cases as well for the command

Relates to the discussion from #914

Testing

• Tested locally
• Added/updated tests
• Added/updated docs

[jglogan]

Ready to move out of draft?

[saehejkang]

I think I am getting the same error mentioned here for the testImagePruneDanglingImages test. It is again, a test that combines an existing image with a run command.

✘ Test testImagePruneDanglingImages() recorded an issue at TestCLIImagesCommand.swift:414:6: Caught error: executionFailed("command failed: \u{1B}[33mWarning!\u{1B}[0m Running debug build. Performance may be degraded.\nError: internalError: \"failed to create container\" (cause: \"notFound: \"image ghcr.io/apple/containerization/vminit:0.16.2 not found\"\")\n")