fix(releaseutil): Removes API version checks from kind sorter

The sorting method for manifests contained a check to see if the API
version existed. This violates separation of concerns as the sorter
should just sort and leave validation to other parts of the code.

Signed-off-by: Taylor Thomas <taylor.thomas@microsoft.com>

pkg/releaseutil/manifest_sorter.go

@@ -129,10 +129,6 @@ func (file *manifestFile) sort(result *result) error {
 			return errors.Wrapf(err, "YAML parse error on %s", file.path)
 		}
 
-		if entry.Version != "" && !file.apis.Has(entry.Version) {
-			return errors.Errorf("apiVersion %q in %s is not available", entry.Version, file.path)
-		}
-
 		if !hasAnyAnnotation(entry) {
 			result.generic = append(result.generic, Manifest{
 				Name:    file.path,