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

The error message might be useless alone

Installation of formulae from URLs has many attack vectors and is
fundamentally insecure, unsupported, regularly recommended against and
generally a terrible idea. There's plenty of ways to take that URL,
manually verify it and put it somewhere that Homebrew does support so
let's deprecate this way of doing things.

Replace with `Homebrew.args.debug?`.

Part of #5730.

This matches what `cask_loader` does and is low risk given we no longer
allow tap pinning.

Fixes #7626

Add more deprecations, disable deprecations and remove disabled code.

I interpreted the existing message as meaning "you don't pin
a tap any more, rather you pin a specific formula from that
tap". I.e. the command still worked, but it had to be done
on a per-formula basis (eg. `brew tap-pin linuxbrew/xorg/mesa` instead
of just `brew tap-pin linuxbrew/xorg`)

IMO, this makes it clearer that the command itself is no longer
supported.

"an commit" is not valid English.

Inspired by https://github.com/Homebrew/brew/issues/7154

- Make all `odeprecated` from 2.1.0 `odisabled` instead
- Remove dead code that won't be run now
- Remove (unused) `or_later` handling for bottles

This will provide a better experience to users rather than a URL that
will likely break in future.

Tap pinning is not used by Homebrew or the Homebrew maintainers so issues relating to pinned taps (#5418, #5796) don’t get fixed. Tap pinning does not work consistently or reliably and is conceptually confusing to encourage users to use fully-scoped user/tap/formula naming or avoid shadowing core tap formulae' names instead.

And `NoMethodError` is a type of `NameError`.

Adjust the rules based on the current codebase. Remove various enable,
disables and default values that are unnecessary. Add more comments
explaining why. Make minor changes needed to enable a few more rules.

This makes formulae unreadable.

See https://discourse.brew.sh/t/error-in-mpfr-2-formula/2575.

Reraise as a `FormulaUnreadableError` as these are formulae that have
mistakes that cannot be trivially repaired.

Fixes #4475.
Fixes #4476.

- Turn more old `odeprecated` into `odisabled`
- Remove more old `odisabled`
- Remove code for older Ruby versions