We only need to test the value of `scoped_items`

The changes tested here are to see if in EE projects in the same groups
count as part of the same relative positioning set. We do not need to
test every method - just the scoping query.

Frankly a bunch of the movement tests could also be removed, but they
are all calling public methods so it is fine for them to test the
interface.

ee/spec/models/issue_spec.rb

@@ -419,29 +419,11 @@ RSpec.describe Issue do
     let_it_be_with_reload(:issue1) { create(:issue, project: project1, relative_position: issue.relative_position + RelativePositioning::IDEAL_DISTANCE) }
     let(:new_issue) { build(:issue, project: project1, relative_position: nil) }
 
-    describe '#max_relative_position' do
-      it 'returns maximum position' do
-        expect(issue.max_relative_position).to eq issue1.relative_position
-      end
-    end
-
-    describe '#prev_relative_position' do
-      it 'returns previous position if there is an issue above' do
-        expect(issue1.prev_relative_position).to eq issue.relative_position
-      end
-
-      it 'returns nil if there is no issue above' do
-        expect(issue.prev_relative_position).to eq nil
-      end
-    end
-
-    describe '#next_relative_position' do
-      it 'returns next position if there is an issue below' do
-        expect(issue.next_relative_position).to eq issue1.relative_position
-      end
+    describe '.relative_positioning_query_base' do
+      it 'includes cross project issues in the same group' do
+        siblings = Issue.relative_positioning_query_base(issue)
 
-      it 'returns nil if there is no issue below' do
-        expect(issue1.next_relative_position).to eq nil
+        expect(siblings).to include(issue1)
       end
     end