Bug 41458: Prevent `mach package-multi-locale` from actually creating a package
macOS builds need some files to be moved around with ./mach package-multi-locale to create multi-locale packages.
The required command isn't exposed through any other mach command.
So, we patch package-multi-locale both to prevent it from failing when doing official builds and to detect any future changes on it.
Closes #41458 (closed)