FEATURE: Add site setting to restrict ignore feature to trust level (#11297)

This adds a new min_trust_level_to_allow_ignore site setting that enables admins to control the point at which a user is allowed to ignore other users.

spec/components/guardian_spec.rb

@@ -2960,6 +2960,9 @@ describe Guardian do
   end
 
   describe '#can_ignore_user?' do
+    before do
+      SiteSetting.min_trust_level_to_allow_ignore = 1
+    end
 
     let(:guardian) { Guardian.new(trust_level_2) }
 
@@ -2983,26 +2986,29 @@ describe Guardian do
       end
     end
 
-    context "when ignorer's trust level is below tl2" do
-      let(:guardian) { Guardian.new(trust_level_1) }
-      let!(:trust_level_1) { build(:user, trust_level: 1) }
-
-      it 'does not allow ignoring user' do
-        expect(guardian.can_ignore_user?(another_user)).to eq(false)
-      end
-    end
-
     context "when ignorer is staff" do
       let(:guardian) { Guardian.new(admin) }
-
       it 'allows ignoring user' do
         expect(guardian.can_ignore_user?(another_user)).to eq(true)
       end
     end
 
-    context "when ignorer's trust level is tl2" do
-      let(:guardian) { Guardian.new(trust_level_2) }
+    context "when ignorer's trust level is below min_trust_level_to_allow_ignore" do
+      let(:guardian) { Guardian.new(trust_level_0) }
+      it 'does not allow ignoring user' do
+        expect(guardian.can_ignore_user?(another_user)).to eq(false)
+      end
+    end
 
+    context "when ignorer's trust level is equal to min_trust_level_to_allow_ignore site setting" do
+      let(:guardian) { Guardian.new(trust_level_1) }
+      it 'allows ignoring user' do
+        expect(guardian.can_ignore_user?(another_user)).to eq(true)
+      end
+    end
+
+    context "when ignorer's trust level is above min_trust_level_to_allow_ignore site setting" do
+      let(:guardian) { Guardian.new(trust_level_3) }
       it 'allows ignoring user' do
         expect(guardian.can_ignore_user?(another_user)).to eq(true)
       end