Remove deprecated and unused typescript code

Author: evilaliv3

client/app/src/models/app/public-model.ts

@@ -89,12 +89,6 @@ export interface Status {
   label: string;
 }
 
-export interface Error {
-  message: string,
-  code: number,
-  arguments: []
-}
-
 export interface Context {
   id: string;
   hidden: boolean;

client/app/src/shared/constants/types.ts

@@ -1,4 +1,2 @@
-export type DisplayStepErrorsFunction = (index: number) => boolean | undefined;
-export type StepFormFunction = (index: number) => any;
 export type cancelFun = null;
-export type ConfirmFunFunction = (receiver_id: { id: number }) => void;
+export type ConfirmFunFunction = (receiver_id: { id: number }) => void;