fix: exit with a non-zero code when showing help

[G-Rath]

Note I've purposely not used a new error code for now because I can't imagine a use-case for wanting to identify this particular situation in a scripting context, which is where exit code values are relevant (we can always use a more specific code later if a use case is presented)

Resolves #2303

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.98%. Comparing base (51834cb) to head (c7ce7b3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2309      +/-   ##
==========================================
+ Coverage   67.95%   67.98%   +0.03%     
==========================================
  Files         172      172              
  Lines       12821    12834      +13     
==========================================
+ Hits         8712     8725      +13     
- Misses       3437     3438       +1     
+ Partials      672      671       -1     

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[another-rex]

The scripting case I'm thinking of is less identifying this specifically, but differentiating argument errors vs some catch all transient errors that might occur. Right now any error that we don't specifically account for is 127.

[G-Rath]

But that's still a scripting context right, in which case I don't see this as being a failure that is really actionable by the user?

[another-rex]

I think the difference is if it's something caused by a network error, it'll go away by itself hopefully, so you don't need to do anything about it. But with invalid args you have to do something.

Hmm I probably have to think through this a bit more, let's merge this as is for now.