Add a new single cell category #1887

Job	Run time
deploy	38s
deploy	38s
test (3.8, lint)	41s
test (3.8, lint)	41s
test (3.8, lint_docs)	1m 21s
test (3.8, lint_docs)	1m 21s
test (3.8, mypy)	44s
test (3.8, mypy)	44s
test (3.8, unit-quick)	18m 34s
test (3.8, unit-quick)	18m 34s
test (3.8, unit-diagnostic-servebasic-gx-dev)	5m 22s
test (3.8, unit-diagnostic-servebasic-gx-dev)	5m 22s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2109)	16m 12s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2109)	16m 11s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2205)	15m 20s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2205)	15m 20s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-dev)	26m 27s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-dev)	26m 27s
test (3.8, unit-nonredundant-noclientbuild-noshed-nogx)	1h 1m 17s
test (3.8, unit-nonredundant-noclientbuild-noshed-nogx)	1h 1m 17s
test (3.8, unit-diagnostic-serveclientcmd)	4m 58s
test (3.8, unit-diagnostic-serveclientcmd)	4m 58s
test (3.11, lint)	38s
test (3.11, lint)	38s
test (3.11, mypy)	44s
test (3.11, mypy)	44s
test (3.11, unit-quick)	17m 48s
test (3.11, unit-quick)	17m 48s
	5h 41m 27s

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