Nextcloud trying to sync when no internet is available.

### ⚠️ 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

1. Have a Nextcloud with many (10s of thousands / 100s of thousands) of files
2. Upgrade app to 3.30.6
3. Nextcloud tries to auto-sync *all* files (see #13872)
4. Disable both wifi *and* mobile data
5. Force stop and reopen app (or reboot phone)
6. See that Nextcloud is still trying to sync and giving 10s/100s of thousands of notification errors
7. If the number of files on Nextcloud is large enough, *the entire phone CPU will be consumed*. On my phone I was unable to open the settings page; I could only uninstall and reinstall the app. This obviously will vary by phone/tablet manufacturer and the number of files/notifications Nextcloud creates.

### Expected behaviour

Nextcloud should not being trying to sync when no internet is available. It may also be wise to have a "stop gap" where if X errors occur in Y seconds then the app pauses for Z seconds before restarting/continuing.

### Actual behaviour

Nextcloud still trying to two-way sync without data, giving thousands of notification errors.

### Android version

Android 14 (LineageOS 21)

### Device brand and model

Pixel 8

### Stock or custom OS?

Custom (explain in "additional information")

### Nextcloud android app version

3.30.6

### Nextcloud server version

30.0.4.1

### Using a reverse proxy?

No

### Android logs

_No response_

### Server error logs

```bash
Not submitted for length, repitition, and privacy, but apache contains thousands of lines like this:

<> - <> [02/Jan/2025:06:26:21 +0000] "PROPFIND /cloud/remote.php/dav/files/<>/<> HTTP/1.1" 207 14321 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.30.6

Nextcloud.log shows no errors.
```

### Additional information

_No response_