Prevent composite array calls on subsets

[bmorris3]

This PR prevents the DQ plugin from applying array compositing logic on spatial subsets that should be specific to image layers. I added a regression test that causes an AttributeError on main (thanks to @javerbukh for reporting!).

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)

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• 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 88.93%. Comparing base (71c8197) to head (bcea12f).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2854      +/-   ##
==========================================
+ Coverage   88.90%   88.93%   +0.02%     
==========================================
  Files         111      111              
  Lines       17148    17165      +17     
==========================================
+ Hits        15246    15266      +20     
+ Misses       1902     1899       -3     

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[javerbukh]

There's no longer a traceback but it does change the color of the background in the image viewer to the color of the subset

Edit: I see that is actually the DQ layer, which can be turned off. I think that's right so I'll go ahead and approve. Thank you!

[kecnry]

Diff looks good to me and I'll trust @javerbukh that it fixes the bug - thanks for the quick fix!