Path specific file sytem setup #54562

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Description

The objective of this issue is to introduce path-scoped mount setup so mount providers no longer have to provide all mounts for a user when setting up for a specific path. To achieve this, the SetupManager should resolve mounts for a specific path by consulting the mounts table to retrieve the closest parent with a mount, call the responsible mount provider to initialize it, and finally stop registering mounts itself.

For this reason Mount Providers will need a getMountsForPaths method.

It may also be necessary to have the mount schema track parent–child relationships to make looking up the nearest ancestor efficient.

Note: the changes mentioned here MUST happen in a non-breaking format. It is NOT an option to edit existing interfaces. For this purpose new interfaces can be created and extend the existing ones.