Update pass to pass_number

[WilliamJamieson]

Closes #349

This PR renames pass to pass_number as pass is a reserved word in python for syntax

Checklist

• Schema changes discussed at RAD Review Board meeting
• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.38%. Comparing base (0fb1239) to head (b72f18b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #360   +/-   ##
=======================================
  Coverage   95.38%   95.38%           
=======================================
  Files           4        4           
  Lines         195      195           
=======================================
  Hits          186      186           
  Misses          9        9           

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[PaulHuwe]

LGTM