feedbacks: don't send redundant dmails when user is banned or loses approver status.

When a user is banned, send them a "You have been banned" dmail instead of a "Your user record has
been updated" dmail.

When a user loses approver status due to inactivity, don't seen them a "Your user record has been
updated" dmail for the "Lost approver privileges" neutral feedback they receive.

test/unit/approver_pruner_test.rb

@@ -10,6 +10,8 @@ class ApproverPrunerTest < ActiveSupport::TestCase
       assert_equal([@approver.id], ApproverPruner.inactive_approvers.map(&:id))
       assert_nothing_raised { ApproverPruner.prune! }
       assert_equal(User::Levels::CONTRIBUTOR, @approver.reload.level)
+      assert_equal(1, @approver.dmails.received.count)
+      assert_equal("Approver inactivity", @approver.dmails.received.last.title)
     end
 
     should "not demote active approvers" do

test/unit/ban_test.rb

@@ -38,14 +38,20 @@ class BanTest < ActiveSupport::TestCase
     end
 
     should "update the user's feedback" do
-      user = FactoryBot.create(:user)
-      admin = FactoryBot.create(:admin_user)
-      assert(user.feedback.empty?)
-      CurrentUser.scoped(admin) do
-        FactoryBot.create(:ban, :user => user, :banner => admin)
-      end
-      assert(!user.feedback.empty?)
-      assert_equal("negative", user.feedback.last.category)
+      user = create(:user)
+      ban = create(:ban, user: user, duration: 100.years, reason: "lol")
+
+      assert_equal(1, user.feedback.negative.count)
+      assert_equal("Banned forever: lol", user.feedback.last.body)
+    end
+
+    should "send the user a dmail" do
+      user = create(:user)
+      ban = create(:ban, user: user, duration: 100.years, reason: "lol")
+
+      assert_equal(1, user.dmails.count)
+      assert_equal("You have been banned", user.dmails.last.title)
+      assert_equal("You have been banned forever: lol", user.dmails.last.body)
     end
   end