make BetaGroup extend to Sync Protocols

Author: DechengMa

Sources/AppStoreConnectCLI/Model/BetaGroup.swift

@@ -84,6 +84,18 @@ extension BetaGroup: Equatable, Hashable {
     }
 }
 
+extension BetaGroup: SyncResultRenderable {
+    var syncResultText: String {
+        self.groupName ?? "group-name"
+    }
+}
+
+extension BetaGroup: FileNameGettable {
+    var fileName: String {
+        "\(app.name ?? "")_\(groupName ?? "group-name")"
+    }
+}
+
 extension AppStoreConnectService {
     private enum BetaGroupError: LocalizedError {
         case betaGroupNotFound(groupNames: [String])