refactor: clean up github and rewrite its auth

packages/backend/src/apps/github/auth/is-still-verified.ts

@@ -0,0 +1,13 @@
+import { IGlobalVariable } from '@automatisch/types';
+import getCurrentUser from '../common/get-current-user';
+
+const isStillVerified = async ($: IGlobalVariable) => {
+  try {
+    const user = await getCurrentUser($);
+    return !!user;
+  } catch (error) {
+    return false;
+  }
+};
+
+export default isStillVerified;