hightligh IGT messages in dmesg
IGT logs some very helpful information around subtest start/end, e.g.:
<6> [489.510644] [IGT] kms_chamelium: starting subtest hdmi-hpd-fast
We can hightlight those messages, e.g.: make the bacground a bit brighter/darker, so they are easier to spot when reading the logs.
With this done we can add some extra logging around atomic commits / chamelium operations / ... to easily correlate what the test is doing to the kernel logs it produces