Fix some issues caught by IntelliJ static code analysis

The most common issues were:
* Arrays.asList() shouldn't be called with a single parameter.
* Broken Javadoc @links.
* Unnecessary casts and type declarations.
* Unnecessary unused variable initializations.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=230994311

java/google/registry/model/SchemaVersion.java

@@ -33,11 +33,10 @@ public final class SchemaVersion {
    */
   private static SortedSet<Class<?>> getAllPersistedTypes() {
     SortedSet<Class<?>> persistedTypes = new TreeSet<>(Ordering.usingToString());
-    Queue<Class<?>> queue = new ArrayDeque<>();
     // Do a breadth-first search for persisted types, starting with @Entity types and expanding each
     // ImmutableObject by querying it for all its persisted field types.
     persistedTypes.addAll(EntityClasses.ALL_CLASSES);
-    queue.addAll(persistedTypes);
+    Queue<Class<?>> queue = new ArrayDeque<>(persistedTypes);
     while (!queue.isEmpty()) {
       Class<?> clazz = queue.remove();
       if (ImmutableObject.class.isAssignableFrom(clazz)) {