Deprecate/disable code for Homebrew 2.5.0.

[MikeMcQuaid]

Do the usual "disable deprecations" and "uncomment pending deprecations" dance and delete/deprecate/disable relevant/related code.

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

[MikeMcQuaid]

@SeekingMeaning Once we've nailed down some new names I'll add (or uncomment) the odeprecated lines in here ☝🏻