Deprecate more fields in RegistryConfig

This primarily addresses issues with TMCH testing mode and email sending utils.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=143710550

java/google/registry/config/TestRegistryConfig.java

@@ -29,21 +29,6 @@ public class TestRegistryConfig extends RegistryConfig {
 
   public TestRegistryConfig() {}
 
-  @Override
-  public Duration getCommitLogDatastoreRetention() {
-    return Duration.standardDays(30);
-  }
-
-  @Override
-  public String getSnapshotsBucket() {
-    return RegistryConfig.getProjectId() + "-snapshots";
-  }
-
-  @Override
-  public boolean getTmchCaTestingMode() {
-    return true;
-  }
-
   @Override
   public Optional<String> getECatcherAddress() {
     throw new UnsupportedOperationException();
@@ -54,38 +39,11 @@ public class TestRegistryConfig extends RegistryConfig {
     throw new UnsupportedOperationException();
   }
 
-  @Override
-  public Duration getSingletonCacheRefreshDuration() {
-    // All cache durations are set to zero so that unit tests can update and then retrieve data
-    // immediately without failure.
-    return Duration.ZERO;
-  }
-
-  @Override
-  public Duration getDomainLabelListCacheDuration() {
-    return Duration.ZERO;
-  }
-
-  @Override
-  public Duration getSingletonCachePersistDuration() {
-    return Duration.ZERO;
-  }
-
   @Override
   public String getReservedTermsExportDisclaimer() {
     return "This is a disclaimer.\n";
   }
 
-  @Override
-  public String getGoogleAppsAdminEmailDisplayName() {
-    return "Testing Nomulus";
-  }
-
-  @Override
-  public String getGoogleAppsSendFromEmailAddress() {
-    return "noreply@testing.example";
-  }
-
   @Override
   public String getRegistrarDefaultWhoisServer() {
     return "whois.nic.fakewhois.example";