Add cal_step status keyword for clean_flicker_noise

[tapastro]

Addresses JP-3639

This PR adds the cal_step keyword for the newly added step clean_flicker_noise.

Tasks

• [ ] update or add relevant tests
• [ ] 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)
  • [ ] run jwst regression tests with this branch installed ("git+https://github.com/<fork>/stdatamodels@<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 66.44%. Comparing base (f78fb11) to head (1996b18). Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #328 +/- ## ======================================= Coverage 66.44% 66.44% ======================================= Files 102 102 Lines 5439 5439 ======================================= Hits 3614 3614 Misses 1825 1825 ```

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[tapastro]

💨 🏁

[melanieclarke]

Thanks @tapastro! I forgot this change would be needed.