add get_email call to __init__

[OwenPriceSkelly]

fixes #523

Overview

This just adds a single get_email call to the GardenClient.__init__ method, which ensures that the client has authed with our backend at least once before attempting to pull a garden or entrypoint to run on the demo endpoint.

This makes it so you can't accidentally try running an entrypoint before the backend has had the chance to add you to the Garden Users globus group.

Discussion

This is definitely a bit of a hack, but so is the backend's automatically adding users to the group. If there's an obvious cleaner way to do this I'm open to it, this was just the first easy fix to come to mind.

Testing

I had to tweak the garden_client fixture so the call to BackendClient.get_user_info would be mocked with test user data. This fixed almost all of the tests except for one backend client test, since the backend_client fixture depends on the garden_client fixture (which now mocks the backend client method being tested).

I'll defer to the judgement of the test czar @hholb, but I decided it was ok to delete the single remaining affected test. It seemed like the logic it was testing of "an exception is raised by the backend" is something that could be (and already is, afaik) covered by the backend's unit tests, but I'm open to pushback on this!

Another more robust / time consuming option would be to make the backend_client fixture independent of the garden_client fixture, I just didn't think it was worth the effort for this PR

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📚 Documentation preview 📚: https://garden-ai--524.org.readthedocs.build/en/524/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.91%. Comparing base (0244c64) to head (8482b41).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #524      +/-   ##
==========================================
- Coverage   74.94%   74.91%   -0.04%     
==========================================
  Files          38       38              
  Lines        2407     2408       +1     
==========================================
  Hits         1804     1804              
- Misses        603      604       +1     

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[WillEngler]

Cool, let's do it!