Revert unrelated files and changes for PR cleanup

Remove extraneous files added during development:
- .yarnrc.yml
- cleanup.js
- eslint.config.mjs
- scripts/build-single-packages.mjs
- types/global.d.ts
- packages/react-integration/demo-app-ts/src/components/demos/ToolbarDemo/ToolbarDemo.tsx

Revert package.json and yarn.lock to main branch state.

Author: khadesamrudhi

.pnp.cjs

@@ -50,7 +50,6 @@
     "eslint": "^9.32.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-markdown": "^5.1.0",
-    "eslint-plugin-patternfly-react": "workspace:^",
     "eslint-plugin-prettier": "^5.2.6",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-compiler": "19.0.0-beta-ebf51a3-20250411",