Skip tests

It's ultimately a no-op, so it's pointless to run them. I've also
dropped the `package.json` field since it's no longer needed.

Also, drop the `workflow_call` event handler to discourage external
callers, since it's not used.

.github/workflows/test.yml

@@ -6,14 +6,10 @@ on:
   push:
     branches: [main]
   workflow_dispatch:
-  workflow_call:
 
 permissions:
   contents: read
 
 jobs:
   test:
     uses: MithrilJS/infra/.github/workflows/run-tests.yml@main
-    with:
-      all-platforms: true
-      all-versions: true