test: update github actions for react ui to use npm not yarn

This slipped through the cracks of #339

Signed-off-by: Nick Mitchell <[email protected]>

Author: starpit

.github/workflows/pdl-live-react-tests.yml

@@ -24,11 +24,9 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: 22
-      - name: Enable Corepack
-        run: corepack enable
       - name: Install dependencies
-        run: yarn
+        run: npm ci
       - name: Install Playwright Browsers
-        run: yarn playwright install --with-deps
+        run: npx playwright install --with-deps
       - name: Test pdl-live viewer
-        run: yarn test
+        run: npm test