ci: use consolidated install helper for enforcer check (#12359)

Fixes #12345

Author: chingor13

.github/workflows/ci.yaml

@@ -220,8 +220,9 @@ jobs:
         cache: maven
     - run: java -version
     - name: Install Maven modules to local Maven repository
-      run: |
-        mvn install -B -ntp  -T 1C -DskipTests -Dclirr.skip -Dcheckstyle.skip
+      run: .kokoro/build.sh
+      env:
+        JOB_TYPE: install
     - run: java -version
     - run: mvn -B -ntp enforcer:enforce@enforce -T 1C
   gapic-libraries-bom:
@@ -234,8 +235,9 @@ jobs:
         distribution: temurin
         cache: maven
     - name: Install Maven modules to local Maven repository
-      run: |
-        mvn install -B -ntp  -T 1C -DskipTests -Dclirr.skip -Dcheckstyle.skip -Denforcer.skip
+      run: .kokoro/build.sh
+      env:
+        JOB_TYPE: install
     - name: Validate gapic-libraries-bom
       uses: googleapis/java-cloud-bom/tests/validate-bom@v26.79.0
       with: