This updates some minor issues that would cause warnings or make things appear to not work, even though they would work fine when actually running a backup.
This PR adds a single API endpoint for listing contents of remote source or backend. With this API, we can greatly simplify the FE as it does not need to know about webmodules for each provider, but can just use the single API.
To support this, the fulldisk module was updated slightly to return enumerable meta entries, similar to ms365 and gws providers.
This PR has a large blast radius because it takes the final step and bumps up the Controller to be fully async.
We have historically done a piece-by-piece update, so all operations were already async but the controller interface was kept synchronous.
With this update, the controller is now fully async and all tests are updated.
Most places where the new C# compiler warns about function names not ending in `Async` were also adressed, giving a massive refactor change.
Functionally, no changes are done.
Kenneth Skovhede