[gateway] manage PolicyException on reset password flow

[leleueri]

When a flow fails on the RESET_PASSWORD flow, a blank page is displayed with internal error message.

Expected Behavior

We should redirect to the "reset password" cofirmation page with an error message

Current Behavior

A blank page is displayed with internal error message.

Possible Solution

Implement a Failure Handler on the RESET_PASSWORD flow to redirect in case of PolichyCHainException

Steps to Reproduce (for bugs)

1. create a http callout that hit a not found resource (enable the exit on error toggle)
2. reset the user password

[patelami]

Env: 3.17.x
Result: PASS

Given I have added HTTP call out flow on reset password
And an HTTP callout hits not found unknown resource
And I setup exit on error true with custom message
And Initiate a login flow
And I request reset password
Then I should see custom error message PASS

Given I have added HTTP call out flow on reset password
And an HTTP callout hits to https://api.gravitee.io/echo
And I setup exit on error false
And Initiate a login flow
And I request reset password
Then I should successfully reset password PASS