feat: Convert all mutation files to js

packages/backend/src/graphql/mutations/delete-connection.js

@@ -0,0 +1,15 @@
+const deleteConnection = async (_parent, params, context) => {
+  context.currentUser.can('delete', 'Connection');
+
+  await context.currentUser
+    .$relatedQuery('connections')
+    .delete()
+    .findOne({
+      id: params.input.id,
+    })
+    .throwIfNotFound();
+
+  return;
+};
+
+export default deleteConnection;