test: disable return false handling

[hyuraku]

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Upgrade odeprecated to odisabled for return false in formula test blocks. return false was deprecated in #21296 (merged 2025-12-21). The deprecation has been live for ~4.5 months.

[Copilot]

Pull request overview

This PR updates Homebrew’s formula test runner (brew test) to treat formula tests that return false as disabled behavior (via Utils::Output.odisabled) rather than merely deprecated behavior (odeprecated), aligning with the direction of removing “return false” handling in formula test blocks.

Changes:

• Switch the warning/error mechanism from Utils::Output.odeprecated to Utils::Output.odisabled when a formula test returns false.
• Make “returning false from tests” behave as a hard-disabled path (raising a MethodDeprecatedError).

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[hyuraku]

I'd like to handle this in the follow-up PR that removes the proc wrapper. Adding caller: here is tricky because of define_method, so a redesign later will be cleaner.

[MikeMcQuaid]

Thanks @hyuraku! I think we should wait for the next minor release for this. I know we missed it in the last one 🤦🏻 but I think kicking in new disables out of the normal release cycle will be confusing. Will keep this open!