get doctests running as part of test actions

[JessicaS11]

While working on #712, I noticed that the codecov report showed some lines as untested that should have been tested by the docstring (and also that some of those same doctests should be failing!). I discovered that despite --doctest-modules being set in pytest.ini, it wasn't running the docstring tests. This PR modifies the pytest.ini file to help it find all the docstring tests and run them (local testing) and the unit_test.yml action to include them in CI testing. It also starts fixing some of the failing docstring tests.

This lack of docstring tests running explains a not-yet-documented mismatch in what product_summary_info provides in v2 after #685 versus the short summary it previously showed.

[github-actions]

👈 Launch a binder notebook on this branch for commit 1d22652

I will automatically update this comment whenever this PR is modified

👈 Launch a binder notebook on this branch for commit 6f83d77

👈 Launch a binder notebook on this branch for commit 8b73c35

👈 Launch a binder notebook on this branch for commit 9724ab9

👈 Launch a binder notebook on this branch for commit 6a29319

👈 Launch a binder notebook on this branch for commit 1be7168

👈 Launch a binder notebook on this branch for commit df46b73

👈 Launch a binder notebook on this branch for commit a884bd4

👈 Launch a binder notebook on this branch for commit d738452

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.65%. Comparing base (647929a) to head (6f83d77).

Additional details and impacted files

@@             Coverage Diff              @@
##           development     #713   +/-   ##
============================================
  Coverage        65.65%   65.65%           
============================================
  Files               37       37           
  Lines             3051     3051           
  Branches           396      396           
============================================
  Hits              2003     2003           
  Misses             971      971           
  Partials            77       77           

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[JessicaS11]

The unit tests will continue to fail due to #723. Going to merge so we can get that fix through without the other version update distractions.