refactor: create function to read admin SDK JSON

src/libs/gcloud/verifyFcmToken.spec.ts

@@ -2,7 +2,7 @@ import { describe, expect, it } from "bun:test";
 
 import { server } from "~/mocks";
 
-import type { AdminSdkCredentials } from "./getGoogleAuthToken";
+import type { AdminSdkCredentials } from "./getAdminSdkCredentials";
 import { verifyFcmToken } from "./verifyFcmToken";
 
 server.listen();