[LDAP Authentication] Reset password for non ldap-accounts forbidden [#3549930]

Problem/Motivation

A non-ldap user in an environment using mixed mode wants to reset his password using the Reset your password link on the user edit form.

Debug Report

Create a new user using drush user:create testuser --password=********
Login with the new user
Enter the user edit form → you will see the Reset your password link nearby the password field
Click on the link → Access forbidden

BTW: at the moment every authenticated user gets an Access denied, it is independent of the user's role.

Proposed resolution

Non-ldap user will be able to use the reset form.

Remaining tasks

Update \Drupal\ldap_authentication\Routing\RouteSubscriber::validateResetPasswordAllowed to allow access for a logged-in users who is not an ldap_user.

Data model changes

Issue fork ldap-3549930

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3549930-ldap-authentication-reset changes, plain diff MR !112
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