feat(telemetry): add keychain availability and token storage metrics (#18971)

packages/core/src/code_assist/oauth2.test.ts

@@ -79,6 +79,14 @@ vi.mock('./oauth-credential-storage.js', () => ({
   },
 }));
 
+vi.mock('../mcp/token-storage/hybrid-token-storage.js', () => ({
+  HybridTokenStorage: vi.fn(() => ({
+    getCredentials: vi.fn(),
+    setCredentials: vi.fn(),
+    deleteCredentials: vi.fn(),
+  })),
+}));
+
 const mockConfig = {
   getNoBrowser: () => false,
   getProxy: () => 'http://test.proxy.com:8080',