cmd/install: fail when pkg not found

[apainintheneck]

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This resolves #14361.

The idea here is to facilitate scripting by always failing whenever a package is not installed successfully. This is
how the upgrade and reinstall commands work but not install because we also search for similar package names before terminating.

The only thing to consider here is if anyone relies on the current behavior which would return success if the package didn't exist but a package with a similar name does exist. I can't see how this behavior would be useful for scripting or something you could consistently rely on so I think it's probably fine to change that behavior.

New Behavior

/u/l/Homebrew (fail-on-pkg-not-found-in-install|✔) $ HOMEBREW_NO_AUTO_UPDATE=1 brew install -n virtualsox
Warning: No available formula with the name "virtualsox". Did you mean virtualpg, virtuoso or virtualenv?
==> Searching for similarly named formulae and casks...
==> Formulae
virtualpg                              virtuoso                               virtualenv ✔

To install virtualpg, run:
  brew install virtualpg

==> Casks
virtual-ii         virtualbox ✔       virtualbox6        virtualc64         virtualgl          virtualhostx

To install virtual-ii, run:
  brew install --cask virtual-ii
/u/l/Homebrew (fail-on-pkg-not-found-in-install|✔) [1]$ echo $status
1

[BrewTestBot]

Review period will end on 2023-01-24 at 00:00:00 UTC.

[MikeMcQuaid]

Makes sense to me, thanks again @apainintheneck!

[BrewTestBot]

Review period skipped due to critical label.