env_config: infer HOMEBREW_FORBID_PACKAGES_FROM_PATHS from HOMEBREW_DEVELOPER #30290

Job	Run time
syntax	44s
vendored gems	44s
formula audit	7m 21s
tap syntax	5m 4s
test default formula (Ubuntu 22.04)	4m 37s
cask audit	3m 16s
test default formula (Ubuntu 20.04)	6m 46s
tests (online)	6m 54s
test default formula (macOS 13 x86_64)	2m 36s
update-test (Ubuntu 22.04)	27s
tests (generic OS)	6m 36s
test default formula (macOS 14 arm64)	1m 19s
update-test (macOS)	35s
tests (Ubuntu 22.04)	6m 51s
tests (Ubuntu 20.04)	6m 53s
tests (macOS 13 x86_64)	6m 50s
tests (macOS 14 arm64)	6m 56s
	1h 14m 29s

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