sql/execinfrapb: remove no-effect nullable from GenerativeSplitAndSca…

…tterSpec

Remove no-effect nullable from GenerativeSplitAndScatterSpec that was causing
warning messages during build.

Release note: None

pkg/sql/execinfrapb/processors_bulk_io.proto

@@ -407,7 +407,7 @@ message GenerativeSplitAndScatterSpec {
   repeated roachpb.Span spans = 10 [(gogoproto.nullable) = false];
   repeated jobs.jobspb.RestoreDetails.BackupLocalityInfo backup_locality_info = 11 [(gogoproto.nullable) = false];
   // HighWater is the high watermark of the previous run of restore.
-  optional bytes high_water = 12 [(gogoproto.nullable) = false];
+  optional bytes high_water = 12;
   // User who initiated the restore.
   optional string user_proto = 13 [(gogoproto.nullable) = false, (gogoproto.casttype) = "github.com/cockroachdb/cockroach/pkg/security/username.SQLUsernameProto"];
   // ChunkSize is the number of import spans per chunk.