Warning mail to the users before suspending them

[wiebkemueller-hsh]

For data protection reasons, user data of users that have not logged in the system have to be suspended after a given period of time.

As an admin ...

• I would like to warn my users that they will be suspended in ... days, so they can login to prevent being suspended
• I would like to configure the amount of days the user has to be inactive before this mail will be sent
• I would like to be able to configure the mailtext that is sent to the user in a mail template in the subplugin

States:

• If the user logs in, the inactivity count starts from zero.
• If the user remains inactive, there are subplugins (e.g. https://github.com/eLearning-TUDarmstadt/moodle-tool_cleanupusers#timechecker or https://github.com/eLearning-TUDarmstadt/moodle-tool_cleanupusers?tab=readme-ov-file#additional-sub-plugins-ldapchecker) that handle the actual user suspension for reasons of inactivity or by checking on the ldap status.

Infrastructure respecting the future scenario:

• As an admin I would like to combine the two methods (timechecker and ldapchecker) to run parallelly. Meaning that the user can be suspended for inactivity or for reasons of not being in ldap anymore.
• The warning mail should still be sent, so it might be useful to apply this code either in an extra subplugin or directly as a functionality that can be turned on directly in the plugin

[slaudel]

That would be a really welcome extension of the plugin and we would like to see it too.