feat(playwright): Remove Cypress auth tests in favor of Playwright auth tests (#35938)

Co-authored-by: Claude <noreply@anthropic.com>

superset-frontend/playwright.config.ts

@@ -26,6 +26,13 @@ export default defineConfig({
   // Test directory
   testDir: './playwright/tests',
 
+  // Conditionally ignore experimental tests based on env var
+  // When INCLUDE_EXPERIMENTAL=true, experimental tests are included
+  // Otherwise, they are excluded (default for required tests)
+  testIgnore: process.env.INCLUDE_EXPERIMENTAL
+    ? undefined
+    : '**/experimental/**',
+
   // Timeout settings
   timeout: 30000,
   expect: { timeout: 8000 },