map JWST to OIFITS keywords prior to validate

[braingram]

As reported by @rcooper295 using AmiOIModel.update results in a ValidationError. This is due to the mapping of JWST to OIFITS keywords only during AmiOIModel.on_save (which is not called during update).

This PR updates AmiOIModel to map JWST to OIFITS keywords before calling validate (which is called during update and also fixes an issue that without this PR AmiOIModel.validate would also similarly fail).

Unit tests were added to verify that AmiOIModel.update and AmiOIModel.validate run successfully for an OIFITS compliant model.

Regression tests run with no errors: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1047/

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[bot]]

Codecov Report

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

Files	Coverage Δ
src/stdatamodels/jwst/datamodels/amioi.py	100.00% <100.00%> (+2.63%)	:arrow_up:

:loudspeaker: Thoughts on this report? Let us know!

[rcooper295]

I tested the changes and they fixed the ValidationWarning I encountered when trying to use AmiOIModel.update. Thanks Brett!