Add testing for Windows

[njmei]

Currently, due to a difference in how Pandas handles dtypes for Windows vs *NIX OSes, tests are failing:

Example failure:

 >       pd.testing.assert_frame_equal(expected, obt)
E       AssertionError: Attributes of DataFrame.iloc[:, 0] (column name="start_frame") are different
E       
E       Attribute "dtype" are different
E       [left]:  int64
E       [right]: int32

Tasks:

• Add "windows-latest" to github actions test matrix for ecephys_etl_pipelines_tests job
• Resolve test failures on Windows build

Validation:

• [ ] CI tests include Windows and all tests pass