Deprecate installing casks/formulae from paths. #30416

Job	Run time
syntax	58s
vendored gems	40s
tap syntax	8m 9s
cask audit	2m 25s
formula audit	7m 19s
test default formula (Ubuntu 22.04)	4m 20s
tests (online)	9m 14s
test default formula (Ubuntu 20.04)	5m 53s
update-test (Ubuntu 22.04)	16s
tests (generic OS)	6m 23s
test default formula (macOS 13 x86_64)	3m 54s
update-test (macOS)	24s
tests (Ubuntu 22.04)	6m 12s
test default formula (macOS 14 arm64)	1m 20s
tests (Ubuntu 20.04)	7m 13s
tests (macOS 13 x86_64)	8m 43s
tests (macOS 14 arm64)	6m 5s
	1h 19m 28s

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