Mark machine as dead if installation does not finish

[majst01]

We saw one machine installing since more than 30day which is unfortunate:

from machine ls:

b8a1ac00-e1a4-11e9-8000-3cecef22ae70    🛡       Installing      34d 16h 2024-09-19T14:19:27Z    34d 16h         shoot--...-firewall-2bb80            100.127.180.57  n1-medium-x86   firewall-ubuntu-3.0.20240703 

Seen as Unknown in machine issues:

b8a1ac00-e1a4-11e9-8000-3cecef22ae70   ●  (46.0W)   yes         ❓                 Installing   34d 16h   the machine is not sending LLDP alive messages anymore (liveliness-unknown)

Should be considered dead in my opinion.

State machine should be adopted accordingly