Remove tags from entitlement filters from the deleted tag's region

The before_destroy callback wasn't previously scoped to the tag's region.
From the global region, usually 99, you could delete a tag from region 1
with value "/managed/costcenter/004".  We would then remove that value from
filters with that tag from entitlements in region 99, even though we deleted
a region 1 tag. The same named tag could still exist in region 99.

This commit ensures that if you delete a region 99 tag, we'll only update filters
in entitlements in region 99.

app/models/tag.rb

@@ -160,7 +160,7 @@ def self.controlled_by_mapping
   private
 
   def remove_from_managed_filters
-    Entitlement.remove_tag_from_all_managed_filters(name)
+    Entitlement.with_region(self.class.id_to_region(id)) { Entitlement.remove_tag_from_all_managed_filters(name) }
   end
 
   def name_path

spec/models/tag_spec.rb

@@ -168,5 +168,24 @@
       MiqGroup.all.each { |group| expect(group.get_managed_filters).to match_array(expected_filters) }
       expect(Tag.all).to be_empty
     end
+
+    it "removing a tag will only remove it from entitlement filters in the tag's region" do
+      tag
+      other_region           = ApplicationRecord.my_region_number + 1
+      other_region_tag       = FactoryBot.create(:tag, :name => "/managed/my_name/test", :id => ApplicationRecord.id_in_region(1, other_region))
+      other_region_miq_group = FactoryBot.create(:miq_group, :entitlement => Entitlement.create!, :id => ApplicationRecord.id_in_region(1, other_region))
+      other_region_miq_group.entitlement.set_managed_filters(filters)
+      other_region_miq_group.save
+
+      other_region_tag.destroy
+
+      # tag and filters from other region are deleted and updated
+      Tag.in_region(other_region) { expect(Tag.all).to be_empty }
+      MiqGroup.in_region(other_region) { MiqGroup.all.each { |group| expect(group.get_managed_filters).to be_empty } }
+
+      # current region tag/filters are not changed
+      expect(Tag.pluck(:id)).to eq([tag.id])
+      MiqGroup.all.each { |group| expect(group.get_managed_filters).to match_array(filters) }
+    end
   end
 end