Revert "DEV: Merge package.json files (#21172)" (#21182)

This reverts commit 49a1e1cd0eac1af823963b9095ac65329d330daf.

Is causing issues in prod-adjacent environments (Jenkins)

spec/lib/discourse_js_processor_spec.rb

@@ -151,7 +151,11 @@ RSpec.describe DiscourseJsProcessor do
 
     let(:mini_racer) do
       ctx = MiniRacer::Context.new
-      ctx.eval(File.open("#{Rails.root}/node_modules/handlebars/dist/handlebars.js").read)
+      ctx.eval(
+        File.open(
+          "#{Rails.root}/app/assets/javascripts/node_modules/handlebars/dist/handlebars.js",
+        ).read,
+      )
       ctx.eval(helpers)
       ctx
     end