RAD-162: Remove GuideWindow and Ref tables from cal_step

[PaulHuwe]

Resolves RAD-162

Closes #400

This PR removes reference file and guidewindow db tables from cal_step schemas.

Checklist

• [x] Schema changes discussed at RAD Review Board meeting
• [x] Added entry in CHANGES.rst under the corresponding subsection
• [ ] Updated relevant roman_datamodels utilities and tests
• [ ] Passed romancal regression testing on Jenkins / PLWishMaster. Link: https://plwishmaster.stsci.edu:8081/job/RT/job/romancal/XXX/

[codecov[bot]]

Codecov Report

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

Project coverage is 95.45%. Comparing base (c1811ab) to head (3e7e6f2). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #420 +/- ## ========================================== + Coverage 95.38% 95.45% +0.06% ========================================== Files 4 4 Lines 195 198 +3 ========================================== + Hits 186 189 +3 Misses 9 9 ```

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