Set the auto_registration.entities.repository.enabled option to true when calling repo register --all

[jhrozek]

Summary

When registering all repositories, what the user really means is
"register all future and current repositories. The current invocation of
the call only registered all current ones. Let's also flip the option to
register all future repositories at the same time.

Fixes: #3817

Change Type

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

1. minder provider get should either show the auto registration is set to false or not set at all
2. minder repo register --provider=$NAME --all
3. minder provider get again should show the auto registration is seat to true

Note: minder repo register --all currently requires the provider name to be passed. We should fix the command to iterate over providers that implement the RepoLister trait instead.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[jhrozek]

@blkt 👀

[coveralls]

coverage: 52.906% (-0.1%) from 53.048%
when pulling 3855a0d on jhrozek:register_all_on_provider_update
into 41e4833 on stacklok:main.