FEATURE: Penalty history improvements (#13359)

* FEATURE: add penalty history when silencing a user

Display penalty history (last 6 months) when silencing/suspending a user

* FEATURE: allow default penalty values to be chosen

Adds a site setting that designates default penalty values in hours.

Silence/suspend modals will auto-fill in the default values, but otherwise
will still allow moderators to pick and overwrite values as normal.

First silence/suspend: first value
Second silence/suspend: second value
etc.

Penalty counts are forgiven at the same rate as tl3 promotion requirements do.

Co-authored-by: jjaffeux <j.jaffeux@gmail.com>

app/serializers/admin_detailed_user_serializer.rb

@@ -22,6 +22,8 @@ class AdminDetailedUserSerializer < AdminUserSerializer
              :full_suspend_reason,
              :suspended_till,
              :silence_reason,
+             :penalty_counts,
+             :next_penalty,
              :primary_group_id,
              :badge_count,
              :warnings_received_count,
@@ -96,6 +98,20 @@ class AdminDetailedUserSerializer < AdminUserSerializer
     object.silence_reason
   end
 
+  def penalty_counts
+    TrustLevel3Requirements.new(object).penalty_counts
+  end
+
+  def next_penalty
+    step_number = penalty_counts.total
+    steps = SiteSetting.penalty_step_hours.split('|')
+    step_number = [step_number, steps.length].min
+    penalty_hours = steps[step_number]
+    Integer(penalty_hours, 10).hours.from_now
+  rescue
+    nil
+  end
+
   def silenced_by
     object.silenced_record.try(:acting_user)
   end