Reverts b7b4c59. Closes Homebrew/homebrew#33414.

Closes Homebrew/homebrew#33364. Fixes Homebrew/homebrew#30844.

This allows making e.g. `Closes #X` point to the correct commit to reduce confusion and allows `--bump` to function correctly.

CannotInstallFormulaError is only raised when another version of the
formula is linked or any of its dependencies are unlinked, in which case
this warning is totally irrelevant. It should be checked after build
errors instead.

This reverts commit 466d0f718bc2241e830393b384294c21194995e0.

install is the only command that can trigger this warning, so it should
be handled before instantiating the installer.

This avoids polluting other tests that might invoke the installer, thus
executing any registered hooks.

This reverts commit 2b472a6e2634a7b7592abb7084b20a098f4a488b.

Fixes Homebrew/homebrew#33431.

Requirements meeting this condition are skipped by the first branch
on the caller side:

https://github.com/Homebrew/homebrew/blob/6c54de812f00658404501719d315202a5551cc1b/Library/Homebrew/formula_installer.rb

Closes Homebrew/homebrew#33398.

It was causing a command to not display correctly.

Closes Homebrew/homebrew#33686.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#33648.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

If we say something failed we should communicate that through the exit
code for the bot and scripts.

Allows easier testing of failures due to bad state.

And include more files.

It doesn't display all formulae any more.