Combine API request spec assertions (#31970)

spec/requests/api/v1/blocks_spec.rb

@@ -32,15 +32,10 @@ RSpec.describe 'Blocks' do
     context 'with limit param' do
       let(:params) { { limit: 2 } }
 
-      it 'returns only the requested number of blocked accounts' do
+      it 'returns only the requested number of blocked accounts and sets link header pagination' do
         subject
 
         expect(response.parsed_body.size).to eq(params[:limit])
-      end
-
-      it 'sets correct link header pagination' do
-        subject
-
         expect(response)
           .to include_pagination_headers(
             prev: api_v1_blocks_url(limit: params[:limit], since_id: blocks.last.id),