Test suite: split various checks feature

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

• Blocked by #6094 (closed)

Original created by @tails on 5707 (Redmine)