convert test_data to pytest

[sneakers-the-rat]

Fix: #1717

additional notes:

• optional params should be Optional
• the SQLStore class has a lot of implicit logic and post-instantiation modification, i tried to do a little there but the ability to instantiate from both a module and a schema without using @classmethods makes refactoring tricky.
• removed static models, generate them instead: the generators change, so the models they generate should too.
• make all outputs temporary files. there is a lot of I/O here that could be avoided by doing in-memory comparisons rather than roundtripping to and from yaml on disk, but i left that in place.
• since the pydantic models have default_factory for optional List args (for now), made the yaml comparison method allow for that.
• made model generation a module-level fixture so we wouldn't be compiling the same modules a bunch of times, but that still happens within the test functions without model compilation being split out into separate unit tests so idk!

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 80.34%. Comparing base (bdabda1) to head (c019e5f).

Files	Patch %	Lines
linkml/utils/sqlutils.py	75.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2050   +/-   ##
=======================================
  Coverage   80.34%   80.34%           
=======================================
  Files         107      107           
  Lines       11967    11968    +1     
  Branches     3418     3418           
=======================================
+ Hits         9615     9616    +1     
  Misses       1783     1783           
  Partials      569      569           

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[pkalita-lbl]

Looks great! Thanks for knocking another directory out.

there is a lot of I/O here that could be avoided by doing in-memory comparisons rather than roundtripping to and from yaml on disk, but i left that in place.

Very true, but I'm happy to have this PR be focused on straightforward conversion!

made model generation a module-level fixture so we wouldn't be compiling the same modules a bunch of times, but that still happens within the test functions without model compilation being split out into separate unit tests so idk!

I like the pattern in general.