subsys: net: socket_tls: Connection vanishes -> Caller blocked forever

[clamattia]

As per discussion in discord. When the physical layer disappears, while in the connect for a tls socket, then the caller is blocked forever.

To reproduce

• A thread that calls connect with tls to a server in a loop and closes again and sleeps a bit.
• Make connection disappear, while in the connect for example disable hotspot on phone or remove power to the router.
• The thread will be blocked forever.

Expected behavior
The calling thread is not blocked forever in those circumstances.

Impact
Will deadlock any connect-calling thread in the described circumstances. The best case scenario is, that the watchdog will trigger if it was implemented properly.

@rlubos has a fix already #78492 thank you for the quick and helpful collaboration.