fix the bounding box of SOSS

[nden]

Resolves JP-nnnn

This PR completes work done earlier where a non-coordinate input (spectral_order) is enabled in the the WCS for NIRISS SOSS mode. To complete this a fix in gwcs is needed as well. Related to #9399

Tasks

• If you have a specific reviewer in mind, tag them.
• add a build milestone, i.e. Build 12.0 (use the latest build if not sure)
• Does this PR change user-facing code / API? (if not, label with no-changelog-entry-needed)
  • write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see changelog readme for instructions)
  • update or add relevant tests
  • update relevant docstrings and / or docs/ page
  • start a regression test and include a link to the running job (click here for instructions)
    • Do truth files need to be updated ("okified")?
      • after the reviewer has approved these changes, run okify_regtests to update the truth files
• if a JIRA ticket exists, make sure it is resolved properly

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.87%. Comparing base (c25698a) to head (1c807f0).
⚠️ Report is 1195 commits behind head on main.

Files with missing lines	Patch %	Lines
jwst/assign_wcs/niriss.py	0.00%	2 Missing ⚠️
jwst/assign_wcs/assign_wcs.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9456      +/-   ##
==========================================
- Coverage   77.92%   77.87%   -0.05%     
==========================================
  Files         362      362              
  Lines       36279    36333      +54     
==========================================
+ Hits        28269    28295      +26     
- Misses       8010     8038      +28     

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