[8.x] Add extra method in PasswortReset for reset URL to match the structure of VerifyEmail

[okaufmann]

Hi,

In a current project, I need to overwrite some methods of the default Laravel notifications (ResetPassword and VerifyEmail).
I noticed that VerifyEmail has an extra method to generate the URL, which is nice. But ResetPassword doesn't have this extra method.

As it provides a convenient way to overwrite just the URL creation method, I thought this could be useful for others to have in the ResetPassword notifications as well. I know you can overwrite things with $toMailCallback and $createUrlCallback but these are not usable when queueing these notifications (Queued jobs do not run in the same thread, so the static values get lost).

What changed:

• moved the logic for URL creation into an extra method (as VerifyEmail has)
• added the created URL as fourth parameter to a possibly used closure in $toMailCallback (as VerifyEmail passes the created url).

I didn't add any tests, as it does not change the logic, it only changes the inner structure of the notification to make it easier to overwrite the URL generation method.

I hope this is a meaningful adjustment...