Generate pyodide assets without hashes in the filename

[snickell]

loadPyodide() hardcodes a list of path-names in JS to load from HTTP, which won't work if Rails modifies the filename to output to the dashboard/public/assets/js/pyodide/** to include a hash.

This PR adds the non-digest-assets Gem to control which assets are output without hashes in the filenames.

After this PR, RAILS_ENV=development bundle exec rake assets:precompile produces output both with and without hashes, like so:

./dashboard/public/assets/js/pyodide/0.25.1/package.json
./dashboard/public/assets/js/pyodide/0.25.1/packaging-23.1-py3-none-any-952adfd0fbede825af3ddd33cf288778a247ef83d92de2118d02e7d188e2d917.whl
./dashboard/public/assets/js/pyodide/0.25.1/packaging-23.1-py3-none-any.whl
./dashboard/public/assets/js/pyodide/0.25.1/pandas-1.5.3-cp311-cp311-emscripten_3_1_46_wasm32-15ebfb3055ea2050434ea90b16d8bbc5f0ab62bb13954d42a368530530bc831e.whl
./dashboard/public/assets/js/pyodide/0.25.1/pandas-1.5.3-cp311-cp311-emscripten_3_1_46_wasm32.whl
./dashboard/public/assets/js/pyodide/0.25.1/pyodide-lock-6526dae570ab7db75019fe2c7ccc6b7b82765c56417a498a7b57e1aaebec39f5.json
./dashboard/public/assets/js/pyodide/0.25.1/pyodide-lock.json
./dashboard/public/assets/js/pyodide/0.25.1/pyodide.asm-512042dfdd406971c6fc920b6932e1a8eb5dd2ab3521aa89a020980e4a08bd4b.js
./dashboard/public/assets/js/pyodide/0.25.1/pyodide.asm-aa920641c032c3db42eb1fb018eec611dbef96f0fa4dbdfa6fe3cb1b335aed3c.wasm
./dashboard/public/assets/js/pyodide/0.25.1/pyodide.asm.js
./dashboard/public/assets/js/pyodide/0.25.1/pyodide.asm.wasm

Generating both with/without the filename hash does double the size of the pyodide assets directory, but this doesn't seem like a big deal because its only adding 65MB atm and assets is already 4G or so.

Can test with: http://localhost-studio.code.org:3000//s/allthethings/lessons/50/levels/1

An alternative approach to the problem is here: #58547