Test suite: split various checks feature
_Originally created by Tails on [#5707 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/5707)_ As currently implemented, `checks.feature` mixes various unrelated checks for the sole reason of improving the test suite runtime. Unfortunately, this is deemed to result in a quickly growing bitrot space. Instead, the scenarii that are currently in there should be split into functionally grouped independent features, that would share a tag expressing that they can share a common background snapshot. Feature Branch: test/5707-split-checks.feature ### Related issues - [x] **Blocked by** tails/tails#6094
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