Uds 1663 check element changes

[davidornelas11]

This pr adds the new check-element-changes too along with fixing the necessary packages that had errors when rendered in a server environment

Description

Checklist

• Tests pass for relevant code changes

Important Reminders

Links

• JIRA ticket
• Unity reference site
• UDS Guidelines

[Copilot]

Pull Request Overview

This PR introduces a new tool for tracking component HTML changes over time and fixes server-side rendering compatibility issues across multiple packages. The main addition is the check-element-changes script that compares component HTML output between different time periods to detect visual changes.

• Adds new check-element-changes script with supporting utilities for server-side component rendering
• Fixes SSR compatibility issues in DOMPurify initialization and test setups
• Updates component mocks and test configurations to support the new tooling

Reviewed Changes

Copilot reviewed 14 out of 17 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/unity-react-core/vite.config.js	Updates global definition to use globalThis for better SSR compatibility
packages/unity-react-core/tsx.config.json	New TypeScript configuration for tsx runtime with image loader settings
packages/unity-react-core/tsconfig.json	Expands TypeScript scope to include scripts directory
packages/unity-react-core/tests/dataLayer.spec.mjs	Adds wait condition to ensure accordion elements are ready before testing
packages/unity-react-core/scripts/server-utils.js	New utility for initializing JSDOM environment for server-side rendering
packages/unity-react-core/scripts/image-loader.js	New custom loader to handle image imports in Node.js
packages/unity-react-core/scripts/check-element-changes.js	Main script for comparing component HTML between time periods
packages/unity-react-core/scripts/check-changes.tsx	Component rendering script that generates HTML snapshots for comparison
packages/static-site/src/pages/Home.tsx	Adds required type prop to Divider components
packages/shared/utils/html-utils.js	Refactors DOMPurify initialization to support SSR
packages/shared/utils/html-utils.d.ts	Updates type definition to allow null return value
packages/component-header-footer/setupTests.js	Adds TextEncoder polyfill for test environment
packages/app-degree-pages/vitest.setup.ts	Imports new unity-react-core mock
packages/app-degree-pages/mocks/unity-react-core-mock.jsx	Simplifies mock by removing unused imports and adding missing component mocks
package.json	Updates script path and adds new dependencies (diff, tsx)

[asu-jenkins-devops]

Storybook deployed at https://unity-uds-staging.s3.us-west-2.amazonaws.com/pr-1601/index.html