[WIP] replace usages of spherical_geometry with sphersgeo

[zacharyburnett]

Resolves JP-nnnn
Resolves RCAL-nnnn

Closes #

This PR addresses ...

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 regression tests with this branch installed ("git+https://github.com/<fork>/stcal@<branch>")
    • jwst regression test
    • romancal regression test

news fragment change types...

• changes/<PR#>.apichange.rst: change to public API
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.general.rst: infrastructure or miscellaneous change

[codecov]

Codecov Report

❌ Patch coverage is 23.52941% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.73%. Comparing base (3f7bd45) to head (44c5e41).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/stcal/skymatch/skyimage.py	13.33%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
- Coverage   89.38%   85.73%   -3.65%     
==========================================
  Files          64       64              
  Lines       10213    10146      -67     
==========================================
- Hits         9129     8699     -430     
- Misses       1084     1447     +363     

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