docs: [#227] add essential rule for unit test naming conventions #1327

Job	Run time
Formatting	17s
Static Analysis (stable)	1m 23s
Static Analysis (nightly)	1m 18s
Units (stable)	6m 56s
Build on macos-latest (stable)	56s
Build on windows-latest (stable)	1m 50s
Build on ubuntu-latest (stable)	37s
Build on macos-latest (nightly)	1m 0s
Build on ubuntu-latest (nightly)	38s
Units (nightly)	7m 5s
Build on windows-latest (nightly)	1m 38s
	23m 38s

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