tailscale should not allow --update-check=false --auto-update=true

### What is the issue?

It is possible to run `tailscale set --update-check=false --auto-update=true` . However, this is not a valid combination, since check must be set if apply is set:

https://github.com/tailscale/tailscale/blob/77123a569ba1055f091db06e2d1b59c09b02f108/ipn/prefs.go#L311

Attempting to set this combination should result in either an error or warning.

### Steps to reproduce

_No response_

### Are there any recent changes that introduced the issue?

_No response_

### OS

Linux

### OS version

_No response_

### Tailscale version

1.90.6

### Other software

_No response_

### Bug report

_No response_