Add default value to Rich Text field

[mnholtz]

What does this PR do?

• Adds Default Value to the Rich Text field
• We had originally disabled it due to requirements for validation, but forgot to add it back in as acceptance criteria for the Image Upload feature

Discussion

• As discussed with @Pashaminkovsky, follow-up work is to validate and properly throw errors if default value is not compatible with the Rich Text editor; we are leaving it up to the Mod Developer to make sure that they're passing html

Demo

https://www.loom.com/share/c9af0bf99ba54c9a8f815bb4fd7a7c11

[github-actions]

When the PR is merged, the first loom link found on this PR will be posted to #sprint-demo on Slack. Do not edit this comment manually.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.77%. Comparing base (8318d74) to head (79d26ad).
Report is 512 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9526      +/-   ##
==========================================
+ Coverage   74.24%   75.77%   +1.52%     
==========================================
  Files        1332     1427      +95     
  Lines       40817    43057    +2240     
  Branches     7634     7923     +289     
==========================================
+ Hits        30306    32625    +2319     
+ Misses      10511    10432      -79     

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[github-actions]

Playwright test results

 153 passed
 1 flaky
 2 skipped

Details

 Open report ↗︎
 156 tests across 51 suites
 10 minutes, 55 seconds
 79d26ad
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Flaky tests

msedge › tests/runtime/modVariables/variableSync.spec.ts › Mod Variable Sync › session variable cross-tab sync

Skipped tests

chrome › tests/runtime/googleSheetsIntegration.spec.ts › can activate a google spreadsheet mod with config options
msedge › tests/runtime/googleSheetsIntegration.spec.ts › can activate a google spreadsheet mod with config options