feat(xtask): ✨ Exit with an error code when appropriate

[zmerp]

No description provided.

[The-personified-devil]

There's a couple more places that use panic as not an error condition but just as "print and exit with error code", so it might make sense to just refactor this out into a simple function (that simply takes a string so we don't need to use a macro) and use that instead.

[zmerp]

@The-personified-devil

There's a couple more places that use panic as not an error condition but just as "print and exit with error code"

I used the common function for a few places in main.rs, there are other places in xtask that use panic but those do not need the help print. At the end of ci.rs and format.rs, those panics are internal errors, not invalid cmd format issue. In prepare_server_deps in dependencies.rs, those panics are already handled in main.rs, they are redundant to allow for exhaustive matching of conditions.