Fix Cubeviz coordinates panel with inaccurate sky coordinates sometimes

[pllim]

Description

This pull request is to:

• fix BUG: Cubeviz parser gives wrong sky coordinates for non-flux cube under certain condition #1991
• fix Moment Map plugin should write out moment map WCS too #1516

TODO

• Investigate failure in test_fits_image_hdu_parse_from_file
• FITS WCS: Is x always RA and y always DEC?
• Wait to update tests only after this is merged: refactor mouseover coords info display #1976
• Vet the fix with real data that goes through _parse_jwst_s3d and _parse_esa_s3d, if possible. I do not know where these data are.

Change log entry

• Is a change log needed? If yes, is it added to CHANGES.rst? If you want to avoid merge conflicts,
  list the proposed change log here for review and add to CHANGES.rst before merge. If no, maintainer
  should add a no-changelog-entry-needed label.

Checklist for package maintainer(s)

This checklist is meant to remind the package maintainer(s) who will review this pull request of some common things to look for. This list is not exhaustive.

• Are two approvals required? Branch protection rule does not check for the second approval. If a second approval is not necessary, please apply the trivial label.
• Do the proposed changes actually accomplish desired goals? Also manually run the affected example notebooks, if necessary.
• Do the proposed changes follow the STScI Style Guides?
• Are tests added/updated as required? If so, do they follow the STScI Style Guides?
• Are docs added/updated as required? If so, do they follow the STScI Style Guides?
• Did the CI pass? If not, are the failures related?
• Is a milestone set? Set this to bugfix milestone if this is a bug fix and needs to be released ASAP; otherwise, set this to the next major release milestone.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[codecov]

Codecov Report

Base: 91.95% // Head: 91.91% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (503f52b) compared to base (434f644).
Patch coverage: 84.78% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2002      +/-   ##
==========================================
- Coverage   91.95%   91.91%   -0.05%     
==========================================
  Files         140      140              
  Lines       15333    15354      +21     
==========================================
+ Hits        14100    14113      +13     
- Misses       1233     1241       +8     

Impacted Files	Coverage Δ
...configs/cubeviz/plugins/moment_maps/moment_maps.py	91.46% <62.50%> (-3.21%)	⬇️
jdaviz/configs/cubeviz/plugins/viewers.py	89.30% <73.33%> (-2.53%)	⬇️
...eviz/plugins/moment_maps/tests/test_moment_maps.py	100.00% <100.00%> (ø)
...aviz/configs/cubeviz/plugins/tests/test_parsers.py	100.00% <100.00%> (ø)

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[pllim]

@mcara said this is the wrong approach. I'll step back and investigate the root of this problem upstream.