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.

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

java/google/registry/tools/CommandWithRemoteApi.java

@@ -12,12 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+package google.registry.tools;
+
 /**
  * Marker interface for commands that use the remote api.
  *
- * <p>Just implementing this is sufficient to use the remote api; {@link RegistryTool} will
- * install it as needed.
+ * <p>Just implementing this is sufficient to use the remote api; {@link RegistryTool} will install
+ * it as needed.
  */
-package google.registry.tools;
-
 interface CommandWithRemoteApi extends Command {}