fix(login): prettier setup (#11798)

# Which Problems Are Solved
Invalid formatting in the login codebase due to invalid prettier
configuration

# How the Problems Are Solved
Fxed .prettierignore wildcards for login source files

# Additional Changes
Removed .prettierrc file because there is already a prettier.config.mjs
file

# Additional Context

apps/login/src/lib/client.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, test, vi, beforeEach } from "vitest";
+import { beforeEach, describe, expect, test, vi } from "vitest";
 import { getNextUrl } from "./client";
 
 // Mock next/headers
@@ -52,5 +52,3 @@ describe("getNextUrl", () => {
     expect(result).toBe("/signedin?loginName=test-user");
   });
 });
-
-