Add `$user_login` and `$user_data` parameters to `retrieve_password_title` filter

[sudar]

The retrieve_password_title filter inside retrieve_password function in wp-login.php file allows you to change the email subject of the password reset emails.

Right now it only has tittle as parameter, where as the similar retrieve_password_message filter which is used to modify the email message has both user_login and user_data as parameters.

The patch that I have attached adds these extra parameters to the retrieve_password_title filter.

Usecase where these new parameter would be used: If a plugin/theme wants to change the subject of the password reset email and include user specific information in the title.

[swissspidy]

Thanks for the patch! Adding these parameters to the filter seems reasonable to me.

[DrewAPicture]

In 35093:

Login: Pass the username and WP_User object to the retrieve_password_title filter.

Adding these parameters creates parity with the retrieve_password_message filter, used for modifying the message body of the same password reset email.

Props sudar.
Fixes #34252.