Generator: Tests: Improve the handling of unsupported features

(cherry picked from commit 3e398ad)

Author: karmi

internal/cmd/generate/commands/gentests/model.go

@@ -230,13 +230,7 @@ func NewAction(payload interface{}) Action {
 		switch k {
 		case "catch":
 			a.catch = v.(string)
-		case "warnings":
-			// TODO
-			continue
-		case "allowed_warnings":
-			// TODO
-			continue
-		case "node_selector":
+		case "warnings", "allowed_warnings", "node_selector", "arbitrary_key":
 			continue
 		case "headers":
 			for kk, vv := range v.(map[interface{}]interface{}) {