Remove duplicated shared examples

spec/support/shared_examples/models/concerns/can_housekeep_repository_shared_examples.rb

-# frozen_string_literal: true
-
-RSpec.shared_examples 'can housekeep repository' do
-  context 'with a clean redis state', :clean_gitlab_redis_shared_state do
-    describe '#pushes_since_gc' do
-      context 'without any pushes' do
-        it 'returns 0' do
-          expect(resource.pushes_since_gc).to eq(0)
-        end
-      end
-
-      context 'with a number of pushes' do
-        it 'returns the number of pushes' do
-          3.times { resource.increment_pushes_since_gc }
-
-          expect(resource.pushes_since_gc).to eq(3)
-        end
-      end
-    end
-
-    describe '#increment_pushes_since_gc' do
-      it 'increments the number of pushes since the last GC' do
-        3.times { resource.increment_pushes_since_gc }
-
-        expect(resource.pushes_since_gc).to eq(3)
-      end
-    end
-
-    describe '#reset_pushes_since_gc' do
-      it 'resets the number of pushes since the last GC' do
-        3.times { resource.increment_pushes_since_gc }
-
-        resource.reset_pushes_since_gc
-
-        expect(resource.pushes_since_gc).to eq(0)
-      end
-    end
-
-    describe '#pushes_since_gc_redis_shared_state_key' do
-      it 'returns the proper redis key format' do
-        expect(resource.send(:pushes_since_gc_redis_shared_state_key)).to eq("#{resource_key}/#{resource.id}/pushes_since_gc")
-      end
-    end
-  end
-end