request: x test vs x test all etc

[Borgerr]

Summary

Essentially documenting the zulip discussion taken from #new members > Linux Distribution @ 💬. We believe a distinction between x test, x test all, and x test <subcategory> would be appreciated, especially with regards to bootstrap tests which may be not very predictable depending on OS, and different contributors with different goals may benefit from only testing a specific subsection of tests.

One such approach would be to error out on a plain x test and give suggestions of different test suites. Another (not necessarily contradictory) approach would be to check prerequisites before running a specific suite.