Run GitHub test actions on Windows and MacOS

[rfrenchseti]

• Fixes #N/A
• Were any Django, import pipeline, or table_schema files modified? Y
  • If YES:
  • Database used (or new import): New import via automated tests
  • FLAKE8 run on modified code: Y
  • All Django tests pass: Y
  • Code coverage run and still at 100%: Y
• Were any JavaScript or CSS files modified? N
  • If YES:
  • JSHINT run on all affected files: Y/NA
  • Tested on Chrome, Firefox, Safari, Edge, and iOS: Y/NA (Remember to test all browser sizes)
  • Tested for race conditions (with delayed API calls if applicable): Y/NA
• Was the documentation reviewed for necessary changes or additions? NA
  • About
  • Getting Started
  • FAQ
  • API Guide
  • Tooltips
  • Import/database schema

Description of changes:

Minor changes to import to work with Windows. Changes to GitHub workflows to work with Windows and MacOS and use self-hosted runners.

Known problems:

None.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3b125f0) 100.00% compared to head (b7d645d) 100.00%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1336 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 41 41 Lines 23120 23101 -19 Branches 1193 1217 +24 ========================================= - Hits 23120 23101 -19 ```

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