Rename Library/Contributions/cmds -> cmd.
Make brew services use the correct filename

Closes #19050.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
brew-services: don't hardcode launchctl path

This change allows users to install the `launchctl` wrapper in the
`reattach-to-user-namespace` formula which makes the command work in
Tmux and other non-standard environments.

Closes #26609.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Remove unnecessary usage of Formula.canonical_name
Deprecate some contributions.

This is just a starting point to start discussion. I think we have a
few options with contributions:

- Stop accepting them altogether and move the ones we need/use/support
  into core commands
- Accept them on an unsupported basis and require they be added
  manually to the PATH
- Actively support and fix bugs in them all

Closes #30749.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
brew-services: mkpath first if destination dir not existed
Remove deprecation warning