Remove unused imports in proto (#8885)

Author: maximyurchuk

ydb/core/protos/backup.proto

@@ -1,8 +1,3 @@
-import "ydb/public/api/protos/draft/ydb_backup.proto";
-import "ydb/public/api/protos/ydb_issue_message.proto";
-import "ydb/public/api/protos/ydb_operation.proto";
-import "ydb/public/api/protos/ydb_status_codes.proto";
-
 package NKikimrBackup;
 option java_package = "ru.yandex.kikimr.proto";
 

ydb/core/protos/flat_scheme_op.proto

@@ -22,7 +22,6 @@ import "ydb/core/tx/columnshard/engines/scheme/defaults/protos/data.proto";
 import "ydb/core/tx/columnshard/common/protos/snapshot.proto";
 import "ydb/core/formats/arrow/protos/accessor.proto";
 
-import "google/protobuf/empty.proto";
 import "google/protobuf/struct.proto";
 
 package NKikimrSchemeOp;

ydb/core/protos/kqp.proto

@@ -7,7 +7,6 @@ import "ydb/library/actors/protos/actors.proto";
 import "ydb/core/scheme/protos/type_info.proto";
 import "ydb/core/protos/kqp_physical.proto";
 import "ydb/core/protos/kqp_stats.proto";
-import "ydb/core/protos/query_stats.proto";
 import "ydb/core/protos/data_events.proto";
 import "ydb/public/api/protos/ydb_status_codes.proto";
 import "ydb/public/api/protos/ydb_table.proto";

ydb/core/protos/statistics.proto

@@ -1,5 +1,4 @@
 import "ydb/core/scheme/protos/pathid.proto";
-import "ydb/core/protos/data_events.proto";
 
 package NKikimrStat;
 

ydb/core/protos/tx_columnshard.proto

@@ -1,7 +1,6 @@
 import "ydb/library/actors/protos/actors.proto";
 import "ydb/core/protos/flat_scheme_op.proto";
 import "ydb/core/protos/long_tx_service.proto";
-import "ydb/core/protos/statistics.proto";
 import "ydb/core/protos/subdomains.proto";
 import "ydb/core/protos/tx.proto";
 import "ydb/core/formats/arrow/protos/fields.proto";

ydb/core/protos/tx_datashard.proto

@@ -12,7 +12,6 @@ import "ydb/core/protos/tablet.proto";
 import "ydb/core/protos/tx.proto";
 import "ydb/core/protos/flat_scheme_op.proto";
 import "ydb/core/protos/table_stats.proto";
-import "ydb/core/protos/statistics.proto";
 import "ydb/core/protos/subdomains.proto";
 import "ydb/core/protos/query_stats.proto";
 import "ydb/public/api/protos/ydb_issue_message.proto";