DOC: Remove my_mask from ImvizExample

[pllim]

Description

This pull request is to remove my_mask from ImvizExample notebook because it is crashing some other cells. my_mask was originally designed with ImvizDitheredExample in mind and simply copied over to ImvizExample later. It is not critical for typical Imviz operations.

Fixes #2638

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

All modified and coverable lines are covered by tests ✅

Comparison is base (8b997fb) 91.52% compared to head (fbaf194) 91.52%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2641   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files         161      161           
  Lines       19989    19989           
=======================================
  Hits        18295    18295           
  Misses       1694     1694           

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[rosteen]

Works for me, thanks!

[kecnry]

Wait, but is there still a bug? Or should we prevent load_regions in this case?

[pllim]

is there still a bug?

If you ever want a full size mask on this particular image set, yes. I think it is in the GWCS + glue coordinates translation somewhere.

Is it worth spending time to hunt down? Probably not.