Forward the `approvals_required` method

Initial exploration of this problem. I would think if an MR needs "X"
approvals, that would supersede the project's rule of "Y" approvals.

We'll see what the pipeline says!

ee/app/models/concerns/approvable.rb

@@ -11,6 +11,7 @@ module Approvable
     approval_needed?
     approved?
     approvals_left
+    approvals_required
     can_approve?
     has_approved?
     authors_can_approve?
@@ -38,10 +39,6 @@ module Approvable
     approvals.size
   end
 
-  def approvals_required
-    [approvals_before_merge.to_i, target_project.approvals_before_merge.to_i].max
-  end
-
   def approvals_before_merge
     return unless approval_feature_available?
 

ee/changelogs/unreleased/29789-merge-request-approvers-in-list-sometimes-doesnt-show-correct-nu.yml

+---
+title: Correctly display the number of approvals for a merge request
+merge_request: 23827
+author:
+type: fixed

ee/spec/models/approval_state_spec.rb

@@ -323,6 +323,15 @@ describe ApprovalState do
       end
     end
 
+    describe '#approvals_required' do
+      it "correctly sums the approvals" do
+        create_rule(approvals_required: 3)
+        create_rule(approvals_required: 10)
+
+        expect(subject.approvals_required).to eq(13)
+      end
+    end
+
     describe '#approvers' do
       it 'includes all approvers, including code owner and group members' do
         create_rule(users: [approver1])

ee/spec/models/merge_request_spec.rb

@@ -684,30 +684,6 @@ describe MergeRequest do
     end
   end
 
-  describe '#approvals_required' do
-    where(:license_value, :db_value, :project_db_value, :expected) do
-      true  | 5   | 6   | 6
-      true  | 6   | 5   | 6
-      true  | nil | 5   | 5
-      false | 5   | 6   | 0
-      false | nil | 5   | 0
-    end
-
-    with_them do
-      let(:merge_request) { build(:merge_request, approvals_before_merge: db_value) }
-
-      subject { merge_request.approvals_required }
-
-      before do
-        stub_licensed_features(merge_request_approvers: license_value)
-
-        merge_request.target_project.approvals_before_merge = project_db_value
-      end
-
-      it { is_expected.to eq(expected) }
-    end
-  end
-
   describe '#mergeable?' do
     let(:project) { create(:project) }