Add env to disable Debrew #28943

Job	Run time
syntax	43s
cask audit	2m 48s
tap syntax	6m 3s
formula audit	6m 40s
docker	4m 44s
test default formula (Ubuntu 22.04)	4m 23s
test default formula (Ubuntu 20.04)	6m 43s
tests (online)	9m 30s
update-test (Ubuntu 22.04)	27s
test default formula (macOS 13 x86_64)	2m 40s
vendored gems	42s
update-test (macOS 13)	34s
test default formula (macOS 14 arm64)	1m 22s
tests (generic OS)	5m 58s
tests (Ubuntu 22.04)	6m 18s
tests (Ubuntu 20.04)	7m 49s
tests (macOS 13 x86_64)	8m 43s
tests (macOS 14 arm64)	4m 31s
	1h 20m 38s

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