[Bug] --version and --help are exiting with failure code

[dandavison]

$ /Users/dan/src/temporalio/cli/temporal-new --version > /dev/null; echo $?
unknown command
1

$ /Users/dan/src/temporalio/cli/temporal-new --help > /dev/null; echo $?
unknown command
1

[lorensr]

Would also be nice if it didn't print unknown command

[josh-berry]

I spent some time looking into this, and I don't think it's easily fixable unless the following two Cobra issues are fixed:

• return non-zero exit code upon non-runnable subcommand spf13/cobra#1156
• Return "unknown command" error for unknown subcommands. spf13/cobra#706

I there's a hack we can put in to detect if help text is being displayed, and use that to exit 0, but it would require not printing help text on an invalid subcommand, and I haven't yet figured out how to control that behavior. (I've been poking at this in between meetings and such so haven't really given it a lot of focused attention though.)

tl;dr Still looking...