Search for cadences within group hierarchy directly

Cadences finder is set behind FF so we cannot use that to
find first cadence in the hierarchy, instead look-up the
cadence directly.

ee/app/finders/iterations/cadences_finder.rb

@@ -14,7 +14,6 @@ module Iterations
 
     def execute
       raise ArgumentError, 'group argument is missing' unless group.present?
-      return Iterations::Cadence.none unless group.iteration_cadences_feature_flag_enabled?
 
       items = Iterations::Cadence.all
       items = by_id(items)

ee/app/graphql/resolvers/iterations/cadences_resolver.rb

@@ -31,7 +31,8 @@ module Resolvers
 
         args[:id] = parse_id(id) if id.present?
 
-        cadences = ::Iterations::CadencesFinder.new(current_user, group, args).execute
+        cadences = ::Iterations::Cadence.none
+        cadences = ::Iterations::CadencesFinder.new(current_user, group, args).execute if group.iteration_cadences_feature_flag_enabled?
 
         offset_pagination(cadences)
       end

ee/spec/finders/iterations/cadences_finder_spec.rb

@@ -34,16 +34,6 @@ RSpec.describe Iterations::CadencesFinder do
       group.add_reporter(user)
     end
 
-    context 'with feature flag disabled' do
-      before do
-        stub_feature_flags(iteration_cadences: false)
-      end
-
-      it 'returns no cadences' do
-        expect(subject).to be_empty
-      end
-    end
-
     context 'iterations cadences for group' do
       it 'returns iterations cadences' do
         expect(subject).to contain_exactly(