feat(hub): reinterpret grouped dock entry category as in-group sub-category #459

Job	Run time
e2e	2m 16s
unit-test / test (ubuntu-latest, 26)	2m 17s
unit-test / test (windows-latest, 22)	5m 37s
unit-test / test (windows-latest, 24)	4m 45s
unit-test / test (ubuntu-latest, 24)	2m 15s
unit-test / test (windows-latest, 26)	4m 42s
unit-test / test (ubuntu-latest, 22)	2m 23s
unit-test / lint	1m 50s
	26m 5s

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