chore: restore test setup from backoffice repo

.github/workflows/test-backoffice.yml

@@ -6,11 +6,15 @@ on:
       - contrib
       - release/*
       - v*/dev
+    paths:
+      - src/Umbraco.Web.UI.Client/**
   pull_request:
     branches:
       - contrib
       - release/*
       - v*/dev
+    paths:
+      - src/Umbraco.Web.UI.Client/**
 
   # Allows GitHub to use this workflow to validate the merge queue
   merge_group:
@@ -22,7 +26,7 @@ env:
   NODE_OPTIONS: --max_old_space_size=16384
 
 jobs:
-  test:
+  build:
     runs-on: ubuntu-latest
     defaults:
       run:
@@ -37,5 +41,23 @@ jobs:
           cache-dependency-path: ./src/Umbraco.Web.UI.Client/package-lock.json
       - run: npm ci --no-audit --no-fund --prefer-offline
       - run: npm run lint:errors
+      - run: npm run build:for:cms
+      - run: npm run check:paths
+      - run: npm run generate:jsonschema:dist
+
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: src/Umbraco.Web.UI.Client
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: src/Umbraco.Web.UI.Client/.nvmrc
+          cache: npm
+          cache-dependency-path: ./src/Umbraco.Web.UI.Client/package-lock.json
+      - run: npm ci --no-audit --no-fund --prefer-offline
       - run: npx playwright install --with-deps
       - run: npm test