Test landing page is reachable without internet connection #3499
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Add test that checks user is able to access the landing page even when HAOS has no internet connection. We still need some sort of outgoing connectivity, so outgoing connection attempts don't end up with "network is unreachable". To simulate this, restricted network is created for the QEMU instance used in the test, and when everything is started, unresponsive default gateway is added.
This intents to test regression that was fixed by home-assistant/supervisor#5204, Supervisor 2024.7.0+ is thus needed for this test to pass.