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/flows/domain/DomainFlowUtils.java

@@ -509,7 +509,6 @@ public class DomainFlowUtils {
    * (if opening the message interval). This may cause an autorenew billing event to have an end
    * time earlier than its event time (i.e. if it's being ended before it was ever triggered).
    */
-  @SuppressWarnings("unchecked")
   public static void updateAutorenewRecurrenceEndTime(DomainBase domain, DateTime newEndTime) {
     Optional<PollMessage.Autorenew> autorenewPollMessage =
         Optional.ofNullable(ofy().load().key(domain.getAutorenewPollMessage()).now());