Default to admin registrar in check_domain commands

The vast majority of the time this is the registrar client ID you want, so
there's no reason to require specifying it everything each time. These are
read-only commands anyway, so the potential negative effects are minimal.

See the existing lock/unlock_domain commands for existing occurrences of this
behavior.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=211857712

java/google/registry/tools/RegistryToolComponent.java

@@ -76,6 +76,8 @@ import javax.inject.Singleton;
       WhoisModule.class,
     })
 interface RegistryToolComponent {
+  void inject(CheckDomainClaimsCommand command);
+  void inject(CheckDomainCommand command);
   void inject(CheckSnapshotCommand command);
   void inject(CountDomainsCommand command);
   void inject(CreateAnchorTenantCommand command);