Explicitly test for console warnings & errors (#6502)

# Description of Changes
Disallow warnings and errors from being thrown in the browser console
during tests unless explicitly expected in the test. Also adds a
Playwright test to prod around some main UI areas and checks that no
warnings/errors have been thrown.

frontend/editor/src/core/setupTests.ts

@@ -1,5 +1,8 @@
 import "@testing-library/jest-dom";
 import { vi } from "vitest";
+import { installFailOnConsole } from "@app/tests/failOnConsole";
+
+installFailOnConsole();
 
 // Mock localStorage for tests
 class LocalStorageMock implements Storage {