Move JS source from packs to entrypoints (#30037)

config/webpacker.yml

@@ -2,7 +2,7 @@
 
 default: &default
   source_path: app/javascript
-  source_entry_path: packs
+  source_entry_path: entrypoints
   public_root_path: public
   public_output_path: packs
   cache_path: tmp/cache/webpacker

tsconfig.json

@@ -20,7 +20,7 @@
   },
   "include": [
     "app/javascript/mastodon",
-    "app/javascript/packs",
+    "app/javascript/entrypoints",
     "app/javascript/types"
   ]
 }