fix: simple editor without solution not loading

[KristinAoki]

This PR resolves the problem editor not load new simple problems and reimplements the changes in #484

Testing

1. Create a new problem
2. Select a problem type
3. Confirm that the editor loads
4. Refresh the page
5. Repeat 2 through 4 until all simple problems have been tested

[codecov]

Codecov Report

Attention: Patch coverage is 80.32787% with 24 lines in your changes missing coverage. Please review.

Project coverage is 89.01%. Comparing base (dedcb14) to head (f755616).
Report is 14 commits behind head on main.

Files	Patch %	Lines
...omponents/SelectionModal/GalleryLoadMoreButton.jsx	16.66%	10 Missing ⚠️
...rc/editors/sharedComponents/TinyMceWidget/hooks.js	76.92%	9 Missing ⚠️
src/editors/containers/ProblemEditor/index.jsx	50.00%	1 Missing ⚠️
src/editors/containers/TextEditor/index.jsx	75.00%	1 Missing ⚠️
...ponents/ImageUploadModal/SelectImageModal/hooks.js	85.71%	1 Missing ⚠️
...ditors/sharedComponents/SelectionModal/Gallery.jsx	66.66%	1 Missing ⚠️
...rc/editors/sharedComponents/TinyMceWidget/utils.js	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
- Coverage   89.25%   89.01%   -0.24%     
==========================================
  Files         246      248       +2     
  Lines        4475     4596     +121     
  Branches      917      961      +44     
==========================================
+ Hits         3994     4091      +97     
- Misses        454      474      +20     
- Partials       27       31       +4     

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[jesperhodge]

Very excited about the performance improvement! That's just a great feature