🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

owl-bot-staging/v1/google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/DatabaseAdminClient.java renamed to google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/DatabaseAdminClient.java

@@ -33,7 +33,6 @@
 import com.google.api.gax.rpc.ClientSettings;
 import com.google.api.gax.rpc.OperationCallSettings;
 import com.google.api.gax.rpc.PagedCallSettings;
-import com.google.api.gax.rpc.StubSettings;
 import com.google.api.gax.rpc.TransportChannelProvider;
 import com.google.api.gax.rpc.UnaryCallSettings;
 import com.google.cloud.spanner.admin.database.v1.stub.DatabaseAdminStubSettings;

owl-bot-staging/v1/google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/DatabaseAdminSettings.java renamed to google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/DatabaseAdminSettings.java

@@ -72,7 +72,6 @@
 import io.grpc.MethodDescriptor;
 import io.grpc.protobuf.ProtoUtils;
 import java.io.IOException;
-import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;
 

owl-bot-staging/v1/google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/gapic_metadata.json renamed to google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/gapic_metadata.json

@@ -35,7 +35,6 @@
 import com.google.api.gax.httpjson.ProtoMessageResponseParser;
 import com.google.api.gax.httpjson.ProtoRestSerializer;
 import com.google.api.gax.httpjson.longrunning.stub.HttpJsonOperationsStub;
-import com.google.api.gax.longrunning.OperationSnapshot;
 import com.google.api.gax.rpc.ClientContext;
 import com.google.api.gax.rpc.OperationCallable;
 import com.google.api.gax.rpc.RequestParamsBuilder;