Update Portal tests from Jest to Vitest (#6391)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: joshblack <3901764+joshblack@users.noreply.github.com>

Author: Copilot

packages/react/jest.config.js

@@ -47,6 +47,7 @@ module.exports = {
     '<rootDir>/src/PageLayout/',
     '<rootDir>/src/Pagehead/',
     '<rootDir>/src/Pagination/',
+    '<rootDir>/src/Portal/',
     '<rootDir>/src/ProgressBar/',
     '<rootDir>/src/Radio/',
     '<rootDir>/src/RadioGroup/',

packages/react/src/Portal/Portal.test.tsx

@@ -1,3 +1,4 @@
+import {describe, expect, it} from 'vitest'
 import Portal, {registerPortalRoot} from '../Portal/index'
 
 import {render} from '@testing-library/react'

packages/react/vitest.config.browser.mts

@@ -60,6 +60,7 @@ export default defineConfig({
       'src/PageLayout/**/*.test.?(c|m)[jt]s?(x)',
       'src/Pagehead/**/*.test.?(c|m)[jt]s?(x)',
       'src/Pagination/**/*.test.?(c|m)[jt]s?(x)',
+      'src/Portal/**/*.test.?(c|m)[jt]s?(x)',
       'src/ProgressBar/**/*.test.?(c|m)[jt]s?(x)',
       'src/Radio/**/*.test.?(c|m)[jt]s?(x)',
       'src/RadioGroup/**/*.test.?(c|m)[jt]s?(x)',