feat(BA-470): Improve local type container registry handling

[jopemachine]

Resolves #3403 (BA-470).

Currently, even local type container registries are constrained by the project value and the name of a non-existent virtual container registry.

This PR removes all unnecessary restrictions, allowing local images to be scanned as they are.

Example

Note

Setting the project column to None allows the scanned image name to become the canonical image name, making the process more natural.

For example, in the previous code, we had to use commands like backend.ai session create local/stable/python, but now we can simplify it to backend.ai session create python.

Important

Please note that this PR changes the way image canonical of Local type images are handled.

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Checklist: (if applicable)

• Milestone metadata specifying the target backport version

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📚 Documentation preview 📚: https://sorna--2980.org.readthedocs.build/en/2980/

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📚 Documentation preview 📚: https://sorna-ko--2980.org.readthedocs.build/ko/2980/

[jopemachine]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(BA-470): Improve local type container registry handling #2980 👈 (View in Graphite)
• feat(BA-72): Enable image rescanning by project #3237
• refactor(BA-462): Container registry project traversal logic of image rescanning #2979
• refactor: Make project column nullable and improve container registry migration script #2978
• main

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