[CHORE] Fixes the CI package build step

[eliknebel]

The issue was a typescript related compilation error.

ERROR in /app/assets/src/adaptivity/scripting.ts
./src/adaptivity/scripting.ts 13:46-88
[tsl] ERROR in /app/assets/src/adaptivity/scripting.ts(13,47)
      TS2569: Type 'IterableIterator<string>' is not an array type or a string type. Use compiler option '--downlevelIteration' to allow iterating of iterators.
ts-loader-default_8e11959e0762e3a1
 @ ./src/adaptivity/rules-engine.ts 72:18-40
 @ ./src/adaptivity/rules.ts 3:21-46

webpack 5.76.0 compiled with 1 error in 10896 ms

This issue was outlined in microsoft/TypeScript#8856. There are a few solutions proposed. One is compiling with the --downlevelIteration flag as the error message indicates, but this can cause adverse performance effects. I ultimately decided to just wrap the Set being being spread in Array.from().