Improve catalog version reporting

[marc-white]

Is your feature request related to a problem? Please describe.

At present, the only way to know what catalog versions are available is to directly look at the directories in /g/data/xp65/public/apps/access-nri-intake-catalog/. This is, obviously, not a great solution.

Describe the feature you'd like

There should be a function, available in Python, that lists all available catalog versions.

The function should list:

• All versions available with the current catalog.yaml file;
• All versions available if a user copies one of the old catalog.yaml files to their home area.

Describe alternatives you've considered

Nil.

Additional context

This is handy for use with a post-catalog build test notebook (#279 ).

[marc-white]

I'd forgotten that version reporting already exists (access_nri_intake.utils.available_versions), but it's pretty limited, can't handle outdated catalog YAMLs, etc. I'm updating it.

[marc-white]

Re-opening this issue - still need to implement version reporting for outdated catalogs, accessible by out-of-date catalog-<min.vers.>-<max.vers.>.yaml files. (None of these exist yet, so not urgent.)