Add "user identity" display to dev tools (#33977)

* Add "user identity" display to dev tools

* Correct incorect hard-coded string in test mock

* Fix up tests

apps/web/test/test-utils/test-utils.ts

@@ -125,6 +125,7 @@ export function createTestClient(): MatrixClient {
             getOwnDeviceKeys: vi.fn().mockResolvedValue({ ed25519: "ed25519", curve25519: "curve25519" }),
             getUserDeviceInfo: vi.fn().mockResolvedValue(new Map()),
             getUserVerificationStatus: vi.fn(),
+            getUserCrossSigningKeys: vi.fn().mockResolvedValue(null),
             getDeviceVerificationStatus: vi.fn(),
             resetKeyBackup: vi.fn(),
             isEncryptionEnabledInRoom: vi.fn().mockResolvedValue(false),

apps/web/test/unit-tests/components/views/dialogs/devtools/__snapshots__/Users-test.tsx.snap

@@ -654,6 +654,14 @@ exports[`<Users /> should render a single user 1`] = `
         </li>
       </ul>
     </section>
+    <section>
+      <h2>
+        Cryptographic identity
+      </h2>
+      <i>
+        Unknown
+      </i>
+    </section>
   </div>
   <div
     class="mx_Dialog_buttons"