Refactor and increase testing

Problem/Motivation

We need tests for user status, test each status in its own file:
1.- A user to be pre-notified
2.- A user to be purged but was already pre-notified
3.- A user that should not be touched or email be sent to (an active user)

Each of above tests needs to:
1.- Test in both the form and cron (as it is also now)
2.- Use only the "Disable the account and keep its content." cancellation

We also need tests for the cancelling method:
1.- a user to be purged (pick a status, doesn't matter)

Each of above tests needs to:
1.- Test in both the form and cron (as it is also now)
2.- Test that the user and his content is handled correctly
3.- We also need to test the email options:

Even though we test some email being send in the first batch of tests, those tests needs to test:
1.- A user to be pre-notified
2.- One user to be purged, was already pre-notified, the cancellation method needs to be one that doesn't delete the user

Each of above tests needs to:
1.- Test in both the form and cron, calling them multiple times to detect spam
2.- Use only the "Disable the account and keep its content." cancellation
3.- Don't test for user status and content, we already test that in prev tests
4.- Also change the setting to disable the emails, run the cron and form again, check that the emails where not sent

Then we test what remains:

PurgeOnCronTest.php, one user to be purged, cron enabled, assert was purged, disable cron, assert was not purged
DisregardInactiveBlockedUsersTest.php, one user active user one inactive user, test the on/off of the setting
RoleLimitationTest.php, one admin user, one authenticated, toggle the setting, assert that once they are pruged, then they are not.
SettingsFormTest.php, the current form test.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes