workflows/docs: enable merge queue/group jobs. #31530

Job	Run time
syntax	41s
formula audit	5m 4s
tap syntax	6m 23s
cask audit	3m 5s
test default formula (Ubuntu 22.04)	1m 37s
update-test (Ubuntu)	23s
test default formula (Ubuntu 20.04)	3m 22s
tests (online)	8m 10s
update-test (macOS)	43s
vendored gems	42s
test default formula (macOS 13 x86_64)	4m 3s
tests (generic OS)	3m 6s
test default formula (macOS 15 arm64)	1m 21s
tests (Ubuntu 24.04)	3m 12s
tests (Ubuntu 22.04)	3m 27s
tests (Ubuntu 20.04)	3m 57s
tests (macOS 13 x86_64)	9m 14s
tests (macOS 15 arm64)	5m 36s
	1h 4m 6s

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