The "Disconnect" button does not cancel the ongoing connection attempt when network disruptions occur

### Please answer the following questions for yourself before submitting an issue.

- [x] I checked the [knowledge base](https://adguard-vpn.com/kb/) and found no answer
- [x] I checked to make sure that this issue has not already been filed

### AdGuard VPN version

2.10.0-.2148

### Environment

```markdown
- OS: Windows 11, version 25H2
- Other network-level software: No
```

### Which DNS server do you use?

Default

### Custom DNS

_No response_

### Use Wintun

- [ ] yes, I do

### Issue Details

Steps to reproduce:
1. Install the applicatiuon, register, agree to share the data for diagnostic
2. Try to connect
3. Failed to connect
4. Disable wintun using
5. Try to connect

Next I tried to connect to other locations. It displays it is connecting to a new location, but after some time it sends a notification "failed to connect, disconnected" or something like this with one of the following:

1. Displaing a previous location with the "Connect" button, after some time the second try (connect to another location) fails and again one of the following;
2. Displaing a new location with connection;
3. Displaing one of the previous locations (if there are more than one try of reconnect to other locations).

I think it does not cancel the connecting attempt before it fails, so the "Disconnect" button and buttons of other locations don't close the previous attempt.

### Expected Behavior

1. Install the applicatiuon, register, agree to share the data for diagnostic
2. Try to connect
3. Use the established connection

### Actual Behavior

Read "Steps to reproduce"

### Screenshots

_No response_