fix lint and enforcer checks

Author: chingor13

.kokoro/common.sh

@@ -23,6 +23,11 @@ excluded_modules=(
   'java-datastore'
   'java-logging-logback'
   'sdk-platform-java'
+  'sdk-platform-java/java-shared-dependencies/dependency-analyzer'
+  'sdk-platform-java/java-shared-dependencies/dependency-convergence-check'
+  'sdk-platform-java/java-showcase'
+  'sdk-platform-java/java-showcase-3.21.0'
+  'sdk-platform-java/java-showcase-3.25.8'
 )
 
 function retry_with_backoff {

sdk-platform-java/pom.xml

@@ -10,6 +10,7 @@
 
   <properties>
     <clirr.skip>true</clirr.skip>
+    <enforcer.skip>true</enforcer.skip>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>