YARN-11879. Fix SpotBugs issues in hadoop-yarn-common module.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml

@@ -726,8 +726,5 @@
     <Package name="org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.placement.schema" />
   </Match>
 
-  <Match><Bug category="EXPERIMENTAL"/></Match>
-  <Match><Bug pattern="AT_.*"/></Match>
-  <Match><Bug pattern="CT_.*"/></Match>
   <Match><Bug pattern="PA_PUBLIC_PRIMITIVE_ATTRIBUTE"/></Match>
 </FindBugsFilter>