feat: [Work in progress] Try Maven parallel builds. (#30454)

* feat: Try Maven parallel builds

.github/workflows/codecov.yml

@@ -22,8 +22,10 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - name: Build with Maven
-        run: mvn -B package --file pom.xml
+      - name: Build with Maven - only frontend
+        run: mvn -T 1C -B package --file pom.xml -pl frontend
+      - name: Build with Maven - other
+        run: mvn -T 1C -B package --file pom.xml -pl '!frontend'
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v3
         with: