RCAL-853: Give VA scale factor a reasonable default

[stscieisenhamer]

WIP RCAL-853

Main PR: PR#1354

This PR gives the velocity_aberration.scale_facter meta a default working value of 1.0

Tasks

• [x] update or add relevant tests
• [x] update relevant docstrings and / or docs/ page
• [ ] Does this PR change any API used downstream? (if not, label with no-changelog-entry-needed)
  • [ ] write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types)
  • [ ] start a romancal regression test with this branch installed ("git+https://github.com/<fork>/roman_datamodels@<branch>")

news fragment change types...

- ``changes/.feature.rst``: new feature - ``changes/.bugfix.rst``: fixes an issue - ``changes/.doc.rst``: documentation change - ``changes/.removal.rst``: deprecation or removal of public API - ``changes/.misc.rst``: infrastructure or miscellaneous change

[codecov[bot]]

Codecov Report

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

Project coverage is 97.01%. Comparing base (087a60d) to head (65c7273). Report is 77 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #396 +/- ## ========================================== - Coverage 97.56% 97.01% -0.55% ========================================== Files 30 37 +7 Lines 2788 3316 +528 ========================================== + Hits 2720 3217 +497 - Misses 68 99 +31 ```

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[stscieisenhamer]

The doc issue must be something upstream. I can investigate or leave to others.