Combine API request spec assertions (#31970)

spec/requests/api/v1/timelines/link_spec.rb

@@ -123,15 +123,11 @@ RSpec.describe 'Link' do
       context 'with limit param' do
         let(:params) { { limit: 1, url: url } }
 
-        it 'returns only the requested number of statuses', :aggregate_failures do
+        it 'returns only the requested number of statuses with pagination headers', :aggregate_failures do
           subject
 
           expect(response).to have_http_status(200)
           expect(response.parsed_body.size).to eq(params[:limit])
-        end
-
-        it 'sets the correct pagination headers', :aggregate_failures do
-          subject
 
           expect(response)
             .to include_pagination_headers(