Remove deprecated/stale code

[kecnry]

Description

This pull request removes API access to plugins that have passed their deprecation period as well as stale code from the former canvas rotation plugin.

Related to:

• Remove UI elements deprecated since 3.9 #3256
• Remove things deprecated since v3.9 #2878

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)?

[kecnry]

@bmorris3 - I vaguely remember this causing you troubles right? Was there anything we did to workaround it that could/should be undone here as well?

[bmorris3]

This isn't causing issues anymore, because we don't use canvas rotation. We now get a white background where there are no data from work starting in glue glue-viz/glue#2482, which was first used in jdaviz in #2671, and also used in the DQ layers. Removing this should (I hope) have no effect.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.80%. Comparing base (01553da) to head (a9c9171).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3270      +/-   ##
==========================================
+ Coverage   88.76%   88.80%   +0.04%     
==========================================
  Files         125      125              
  Lines       18963    18928      -35     
==========================================
- Hits        16832    16809      -23     
+ Misses       2131     2119      -12     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[pllim]

Oops, thanks for cleaning up after #2878 . LGTM. Thanks!

[cshanahan1]

The 'cubeviz_ndarray_gif' notebook still has a reference to Export Plot, otherwise look good!

[pllim]

Has a conflict now. Please rebase. Thanks.