chore: Switch repo to use pnpm (#29928)

* Fix some missing and duplicate dependencies.

* Fix the types for jest in ai-commands package.

* Replace all npm commands with pnpm. Add pnpm files and workspace links.

* Fix rimraf to work with pnpm.

* Refactor the github actions to work with pnpm.

* Delete package-lock.json.

* Fix the tailwind configs to not include node_modules.

* Fix random files.

* Add preinstall scripts to all packages.

* Fix the Dockerfile to work with pnpm.

* Update the DEVELOPERS documentation.

.github/workflows/ui-patterns-tests.yml

@@ -21,14 +21,20 @@ jobs:
           sparse-checkout: |
             packages
 
+      - uses: pnpm/action-setup@v4
+        name: Install pnpm
+        with:
+          version: 9.10.0
+          run_install: false
+
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:
           node-version-file: '.nvmrc'
-          cache: 'npm'
+          cache: 'pnpm'
 
       - name: Install deps
-        run: npm ci
+        run: pnpm i
 
       - name: Run tests
-        run: npm run test:ui-patterns
+        run: pnpm run test:ui-patterns