Populate starter assets with real data

[maddiedierker]

Finishes LP-609, by hooking up starter assets to use real data from the server!

Video of usage (not the most beautiful image choice, though):

[codecov-io]

Codecov Report

Merging #30526 into staging will decrease coverage by <.01%.
The diff coverage is 93.33%.

@@             Coverage Diff             @@
##           staging   #30526      +/-   ##
===========================================
- Coverage    73.22%   73.21%   -0.01%     
===========================================
  Files         2056     2056              
  Lines       112995   113020      +25     
  Branches      3490     3491       +1     
===========================================
+ Hits         82739    82753      +14     
- Misses       26977    26987      +10     
- Partials      3279     3280       +1

Flag	Coverage Δ
#integration	55.73% <53.84%> (-0.02%)	⬇️
#storybook	56.55% <43.47%> (ø)	⬆️
#unit	58.09% <80.76%> (ø)	⬆️

Impacted Files	Coverage Δ
dashboard/app/helpers/levels_helper.rb	85.48% <100%> (+0.03%)	⬆️
apps/src/applab/redux/applab.js	97.43% <100%> (+0.46%)	⬆️
apps/src/applab/applab.js	83.98% <100%> (+0.02%)	⬆️
dashboard/app/controllers/levels_controller.rb	93.78% <100%> (+0.03%)	⬆️
...app/controllers/level_starter_assets_controller.rb	89.47% <100%> (ø)	⬆️
dashboard/app/models/levels/blockly.rb	95.43% <100%> (+0.01%)	⬆️
apps/src/assetManagement/assetPrefix.js	73.07% <100%> (-2.48%)	⬇️
apps/src/code-studio/components/ImagePicker.jsx	66.03% <66.66%> (-1.36%)	⬇️
apps/src/code-studio/components/AssetManager.jsx	51.47% <75%> (+0.35%)	⬆️
apps/src/logToCloud.js	28.78% <0%> (-7.58%)	⬇️
... and 7 more

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