fix: separate initialValue to not cause re-render on updates

[marslanabdulrauf]

Description

This PR fixes re-render issue with TinyMCE which cause lost in state and the cursor position

Supporting information

(Internal) https://github.com/mitodl/hq/issues/9100

Short Video: https://github.mit.edu/storage/user/923/files/0c224c31-a86b-4346-a505-e697295d0083

Adding any text in course overview section in Schedule and Details Page causes the cursor to go back to initial point or at the very start of the editor.
This is because we are changing the initialValue of the Editor when we add/update any text which causes re-render.

Referece: https://www.tiny.cloud/docs/tinymce/5/react/#initialvalue

Testing instructions

Steps to Reproduce

1. Go to Studio Schedule and Details.
2. Go to Course Overview
3. Enter text in field

Expected Behavior

Expect to be able to enter text in field

Actual Behavior

When enter text, the cursor pops back to the 1st position in the field at every character.

[openedx-webhooks]

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[bradenmacdonald]

This seems to be a different take on fixing the same bug as #2437 is trying to fix. I wonder if this fix will be more reliable.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.82%. Comparing base (36c9eba) to head (b265b17).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2599      +/-   ##
==========================================
+ Coverage   94.81%   94.82%   +0.01%     
==========================================
  Files        1225     1226       +1     
  Lines       27481    27559      +78     
  Branches     6187     6211      +24     
==========================================
+ Hits        26056    26133      +77     
+ Misses       1367     1355      -12     
- Partials       58       71      +13     

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[marslanabdulrauf]

Hi @bradenmacdonald, just checking in - would you be reviewing this PR?

[bradenmacdonald]

Thanks! This fix is working well for me. I appreciate the comment you added to explain it.

In future, I'd like to refactor this whole thing, because it can really be simplified if we use React Query instead. But for now this seems to be a good fix for the issue.

[bradenmacdonald]

@marslanabdulrauf could you please backport this to Ulmo?

[marslanabdulrauf]

@marslanabdulrauf could you please backport this to Ulmo?

yes, here is the backport PR: #2604