data-menu: exclude subset on orientation layer in visibility logic

[kecnry]

Description

This pull request ensures that spatial subsets when linked by WCS do not show a mixed visibility state due to the (non-visible) subset state attached to the WCS-only orientation layer. This was simpler to implement than only considering the top layer, and should effectively yield the same results unless the user manually modifies subset visibility state at a per-layer level.

This is to address #3220 (comment)

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. Bugfix milestone also needs an accompanying backport label.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.14%. Comparing base (a8b3e03) to head (02a8f2b).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3373   +/-   ##
=======================================
  Coverage   88.13%   88.14%           
=======================================
  Files         127      127           
  Lines       19695    19698    +3     
=======================================
+ Hits        17359    17362    +3     
  Misses       2336     2336           

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[rosteen]

Works for me, thanks!

[gibsongreen]

This looks good to me!