fix(sharing-ng): Adapt role conditions to match resource types

This switches our hardcode unfied role conditions to better reflect what
we're actually using them before. The new conditions also allow to differentiate
between roles elgitible for files, folders or drive roots.
Which means that the `/permissions` endpoint is now able to populate the
`roles.allowedValues` field with the correct roles for type of the resource
it is called for.

Fixes: #8331
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f