feat: alter unsaved search deletion and add option for last used lists

[AlexanderBlanchardAC]

This commit alters the deletion of unsaved searches to be carried out each time the cron script runs. It also adds the option for libraries to choose to have stored information about the last list a user has accessed deleted after 14 days.

Test Plan:

1. Apply the patch.
2. Navigate to Primary Configuration > Library Systems.
3. Select your library and click to edit.
4. Use the search bar to find 'Delete last used list after 14 days' or locate this new option under the 'Searching' section.
5. The box should be unchecked by default as this is an opt in option.
6. When checked, when the cron runs, information from the users table relating to their last list used will be deleted if it has not been updated for at least 14 days.