Migrate Cypress E2E from cy.intercept to MSW service worker

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cypress/e2e/accountAdmin/confirmPasswordMessage.cy.js

@@ -10,7 +10,7 @@ describe("Password validation on create account.", () => {
   beforeEach(() => {
     loginWithFixtures();
     cy.visit("/account-admin");
-    cy.wait("@getUsers");
+    cy.contains("Test Admin").should("exist");
   });
 
   it("When password is too short, confirm button stays disabled.", () => {