DEV: Simplify sprockets configuration (#24111)

- Remove the wildcard crawler. This was already excluding almost all file types, but the exclude list was missing '.gjs' which meant those files were unnecessarily being hoisted into the `public/` directory during precompile

- Automatically include all ember-cli-generated assets without needing them to be listed. The main motivation for this change is to allow us to start using async imports via Embroider/Webpack. The filenames for those new async bundles will not be known in advance.

- Skips sprockets fingerprinting on Embroider/Webpack chunk JS files. Their filenames already include a fingerprint, and having sprockets change the filenames will cause problems for the async import feature (where filenames are included deep inside js bundles)

This commit also updates our ember-cli build so that it skips building plugin tests in the production environment. This should provide a slight build speed improvement.

lib/freedom_patches/sprockets_patches.rb

@@ -50,11 +50,14 @@ Sprockets::DirectiveProcessor.prepend(
   end,
 )
 
-# Skip digest path for workbox assets. They are already in a folder with a digest in the name.
+# Skip sprockets fingerprinting for some assets
 Sprockets::Asset.prepend(
   Module.new do
     def digest_path
-      return logical_path if logical_path.match?(%r{^workbox-.*/})
+      # Workbox assets are already in a folder with a digest in the name
+      return logical_path if logical_path.start_with?("workbox-")
+      # Webpack chunks are already named based on their contents
+      return logical_path if logical_path.start_with?("chunk.")
       super
     end
   end,