catch expected NoTypeWarnings in tests

[braingram]

I noticed a few expected NoTypeWarning messages in the test logs. This PR uses pytest.warns to catch (and check for) these warnings and modifies the import of NoTypeWarning in test_schema_against_crds.py to make sure that the issued NoTypeWarning class in the warning filter matches the one issued by the code (this can differ if the tests are run from the repository by the code being tested is installed).

Checklist

• added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (43877cb) 63.69% compared to head (1cfff19) 63.69%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #172   +/-   ##
=======================================
  Coverage   63.69%   63.69%           
=======================================
  Files         100      100           
  Lines        5517     5517           
=======================================
  Hits         3514     3514           
  Misses       2003     2003           

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[braingram]

jwst downstream test failures are expected and unrelated. They are related to
spacetelescope/jwst#7590
and
spacetelescope/jwst#7605

[hbushouse]

Looks OK to me.