Remove requirement of internal tool to check for version on AWS models (#2832)

Author: Madrigal

internal/repotools/cmd/syncAPIModels/main.go

@@ -67,7 +67,6 @@ func copyModelFile(model SourceModel) error {
 // SourceModel provides the type for a model that should be copied.
 type SourceModel struct {
 SDKID string
-Version string
 SrcFilepath string
 DstFilename string
 }
@@ -110,10 +109,6 @@ func findSmithyModels(modelPath string) (map[string]SourceModel, error) {
 if shape.Type != "service" {
 continue
 }
-if len(shape.Version) == 0 {
-return fmt.Errorf("smithy service doesn't have version %s %s",
-name, path)
-}
 if shape.Traits.Service == nil {
 // Ignore services that don't have an SDK id.
 continue
@@ -133,7 +128,6 @@ func findSmithyModels(modelPath string) (map[string]SourceModel, error) {
 // TODO what about two services in same model file?
 models[sdkID] = SourceModel{
 SDKID: sdkID,
-Version: shape.Version,
 SrcFilepath: path,
 DstFilename: sdkID + ".json",
 }