Remove Java checks from new push trigger config (#328)

The current trigger (using config cloudbuild.java.yaml) runs on branches other than master as well. Since Java checks already run on presubmit, I am removing them from this trigger's config which runs post-submit. When editing the import-push-java trigger, I'll also change it to run only on pushes to master.

build/ci/cloudbuild.push.yaml

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Cloud build config that is triggered on a push to master.
 # This cloud build is triggered when there is code change, but can also involve
 # data change.
 
@@ -29,10 +30,3 @@ steps:
         cd /tmp/deployment
         ./scripts/update_external_repo_version.sh $REPO_NAME $SHORT_SHA
     waitFor: ["-"]
-
-# Generate protoc, build, check-format and run test
-  - id: "format & test"
-    name: "maven:3-jdk-11"
-    entrypoint: "mvn"
-    args: ["com.spotify.fmt:fmt-maven-plugin:check", "test"]
-    waitFor: ["-"]