Crash if destination is invalid

Problem/Motivation

Hello, if the destination address does not start with '/' '?' '#' you will get an error:
Failed to authenticate user. Exception: The user-entered string 'home' must begin with a '/', '?', or '#'.

Proposed resolution

I think that an incorrect destination address should not affect the login result.
Remove unnecessary processing of the destination address with Url::fromUserInut().

Destination address without '/' '?' '#' is also considered valid and is processed by the kernel. For example, if you remove the slash from the destination in the login form, nothing will break and you will be redirected.