Support password policy validation to update password expiration.

Problem/Motivation

The Password Policy module expects either a login via a one-time login link—setting the user_pass_reset form state variable—or that the user provides both the current and a new password. Currently, the Simple Password Reset flow does neither of these.

Reference:
https://git.drupalcode.org/project/password_policy/-/blob/4.0.x/password...

Steps to reproduce

1. Set up a password expiration policy using Password Policy.
2. Use Simple Password Reset to change a user's password.
3. Observe that the password expiration date is not updated.

Proposed resolution

Set the user_pass_reset form state variable during the Simple Password Reset process. This allows Password Policy to recognize the reset context and update the expiration date accordingly during validation.

Reference for user_pass_reset:
https://git.drupalcode.org/project/drupal/-/blob/10.4.x/core/modules/use...