Disable scanning of external (USB) drives

### ⚠️ 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

Connect external drive.

### Expected behaviour

Nextcloud should ask for each external drive with notification each time they connected.
As well as should be an option to disable notification completely.

### Actual behaviour

Nextcloud starts scanning it instantly draining the battery to zero and spamming with thousands of notifications about new folders with media, beeping on each. Beep beep beep, for half a hour if there are thousands of them.

### Android version

10.0

### Device brand and model

Huawei

### Stock or custom OS?

Stock

### Nextcloud android app version

3.26

### Nextcloud server version

27

### Using a reverse proxy?

I don't know

### Android logs

_No response_

### Server error logs

_No response_

### Additional information

_No response_