[PM-22305] Upgrade typescript to 5.8 (#15044)

Upgrade to the latest supported typescript version in Angular.

Resolved TS errors by:
  - adding `: any` which is what the compiler previously implied and now warns about.
  - adding `toJSON` to satisfy requirement.

libs/auth/src/common/login-strategies/webauthn-login.strategy.spec.ts

@@ -75,7 +75,7 @@ describe("WebAuthnLoginStrategy", () => {
 
     // We must do this to make the mocked classes available for all the
     // assertCredential(...) tests.
-    global.PublicKeyCredential = MockPublicKeyCredential;
+    global.PublicKeyCredential = MockPublicKeyCredential as any;
     global.AuthenticatorAssertionResponse = MockAuthenticatorAssertionResponse;
   });
 
@@ -397,4 +397,8 @@ export class MockPublicKeyCredential implements PublicKeyCredential {
   static isUserVerifyingPlatformAuthenticatorAvailable(): Promise<boolean> {
     return Promise.resolve(false);
   }
+
+  toJSON() {
+    throw new Error("Method not implemented.");
+  }
 }