Improve unit tests

[sdahdah]

Some unit tests are slow and require Mosek, so they can't be run server-side. Only a subset of the tests are currently run. Unit tests need to be reorganized so that the most possible tests can be run at each merge.

[sdahdah]

Mosek OptServer can be used to run slow tests:

 _default_solver_params: Dict[str, Any] = {
    'mosek_server': 'http://solve.mosek.com:30080',
}

May need to add a PyTest marker for tests that require an internet connection then...

[sdahdah]

Also need to remove raw floating point values from doctests, as they can vary by platform