ci: install frontend deps

Author: guenhter

.github/workflows/test.yml

@@ -59,7 +59,10 @@ jobs:
           node-version: "20"
       - name: Install pnpm
         run: npm install -g pnpm
-      - name: Install dependencies
+      - name: Install dependencies for frontend
+        working-directory: frontend_omni
+        run: pnpm install
+      - name: Install dependencies for tests
         working-directory: ${{ matrix.working-dir }}
         run: pnpm install
       - name: Install Playwright browsers