Wizard: Deprecate image mode flag (HMS-10721)

[regexowl]

This deprecates 'image-builder.image-mode.enabled' flag to fully promote the functionality.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.54%. Comparing base (b4838a9) to head (57a03c2).

@@            Coverage Diff             @@
##             main    #4463      +/-   ##
==========================================
+ Coverage   74.52%   74.54%   +0.02%     
==========================================
  Files         229      229              
  Lines        7481     7477       -4     
  Branches     2780     2778       -2     
==========================================
- Hits         5575     5574       -1     
+ Misses       1639     1636       -3     
  Partials      267      267              

Files with missing lines	Coverage Δ
...ents/CreateImageWizard/steps/ImageOutput/index.tsx	89.65% <100.00%> (+2.55%)	⬆️
src/Utilities/useGetEnvironment.ts	42.85% <ø> (+3.72%)	⬆️

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[mgold1234]

/lgtm

[regexowl]

/retest

[regexowl]

Resolved the conflicts

[kingsleyzissou]

Will wait for this to land before approving the next one 😅