feat(admin): allow deletion of users according to config property
Created by: HejdaJakub
- There is new config property 'user_deletion_forced' which defines if users on instance can be deleted or anonymized (this is the default option).
- This task is related to new backend implementation where deletion of user is now connected with blocking of user's logins.
- The new configuration property 'user_deletion_forced' (default false) was added. When this property is not set, still the default anonymization will be applied.
BREAKING-CHANGE: new configuration property 'user_deletion_forced'