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.

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

java/google/registry/tools/server/ResaveAllHistoryEntriesAction.java

@@ -47,7 +47,6 @@ public class ResaveAllHistoryEntriesAction implements Runnable {
   @Inject Response response;
   @Inject ResaveAllHistoryEntriesAction() {}
 
-  @SuppressWarnings("unchecked")
   @Override
   public void run() {
     mrRunner