handled error cases for external auth login

frontend/src/const.ts

@@ -17,7 +17,8 @@ export const publicPaths = [
   `/subprocessors`,
   `/verify-email`,
   `/password-reset`,
-  `/login/provider/success`
+  `/login/provider/success`,
+  `/login/provider/error`
 ];
 
 export const languageMap = {

frontend/src/pages/login/provider/error.tsx

@@ -0,0 +1,7 @@
+export default function LoginProviderError() {
+    return (
+        <div className="bg-gradient-to-tr from-bunker-500 to-bunker-800 h-screen flex flex-col justify-center pb-28 px-6 items-center">
+            <span className="text-white text-xl" >Oops! An error has occured.</span>
+        </div>
+    )
+}