Fix some statically detected code issues

This includes: unnecessary semicolons, suppress warnings, switch statements, final/private qualifiers, Optional wrapping, conditionals, both inline and non-inline variables, ternaries, Collection putAll() calls, StringBuilders, and throws declarations.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=244182539

java/google/registry/model/registrar/Registrar.java

@@ -165,7 +165,7 @@ public class Registrar extends ImmutableObject implements Buildable, Jsonifiable
      * This registrar is completely disabled and cannot perform any EPP actions whatsoever, nor log
      * in to the registrar console.
      */
-    DISABLED;
+    DISABLED
   }
 
   /** Regex for E.164 phone number format specified by {@code contact.xsd}. */