fix(secure-onboarding) Update the cloudauth pb.go files (#432)

* fix(secure-onboarding) Update the cloudauth pb.go files

Fix summary:
--------------
Update the cloudauth go files to support newly added providerAlias field.

* Adding DiscardUnknown to prevent against future fields addition

Author: ravinadhruve10

sysdig/internal/client/v2/cloudauth.go

@@ -123,7 +123,7 @@ func (client *Client) unmarshalProto(data io.ReadCloser) (*CloudauthAccountSecur
 		return result, err
 	}
 
-	err = protojson.Unmarshal(body, result)
+	err = protojson.UnmarshalOptions{DiscardUnknown: true}.Unmarshal(body, result)
 	return result, err
 }