Contents of sync'd folder left after a rename (in Android/media/com.nextcloud.client/)

### ⚠️ Before posting ⚠️

- [X] This is a **bug**, not a question or an enhancement.
- [X] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [X] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

Unfortunately, not sure.

Some of the times I rename a synchronized folder, the Nextcloud Android App does not detect the rename and re-downloads all affected files from scratch.

However, some of the times, it even does not remove the obsolete, renamed folder from `~/Android/media/com.nextcloud.client`, which causes them to still occupy space.

These folders / files are no longer visible in the Nextcloud Android app itself, and I only noticed because there were photos in some of the affected directories which were suddenly displayed as two duplicate albums by the Google Photos app.

I now noticed that this problem already seems to have happened years ago, but also happened recently in July with the then-current version of the Nextcloud App.

### Expected behaviour

Renamed directories which are not detected as renamed should be at least detected as deleted and be removed from the internal data store - especially, if the App does not even show them any more in its UI.

Also, in case for some reason garbage like that ended up in the internal data store in `~/Android/media/com.nextcloud.client` (maybe due to some earlier bugs), it should be "garbage collected" frequently so no space is wasted which is inaccessible for the regular "plain" user.

### Actual behaviour

Garbage data which does not really "exist" any more and is not shown in the Nextcloud App UI is still present in the internal data store, occupies space and leads to confusing behaviour of apps which just scan the filesytem for files recursively (like "duplicate" photo albums shown by Google Photos which should not exist).

In my case, gigabytes of space was wasted in such files.

It also may be some security issue in case there's still sensitive data present which the user thought to have deleted months ago.

The `Kasachstan` folder in the screenshot below was renamed and now the whole hierarchy existed twice in my Nextcloud data store, once in a "frozen" state with the original name `Kasachstan` and once properly updated with the new name.


### Android version

Android 10

### Device brand and model

Nokia 8 Sirocco

### Stock or custom OS?

Stock

### Nextcloud android app version

3.21.0

### Nextcloud server version

23.0.8

### Using a reverse proxy?

Yes

### Android logs

There is no `data` directory directly in my Android user directory at `storage/emulated/0/`.

### Server error logs

_No response_

### Additional information

_No response_