fix response header (Link) for all_quizzes api

flag=none

closes QUIZ-7487

test plan:
- create a course with more than 2 quizzes (new or old)
- open dev tool of chrome
- make a request to /api/v1/courses/:id/all_quizzes?per_page=2
- there should be response Link header, with correct current and
  next urls

Change-Id: Ic58ba11e8eed4e24a37004cc45c20be67944b35c
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/228813
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Stephen Kacsmark <skacsmark@instructure.com>
QA-Review: Mark McDermott <mmcdermott@instructure.com>
Product-Review: Han Yan <hyan@instructure.com>

app/controllers/quizzes_next/quizzes_api_controller.rb

@@ -43,7 +43,7 @@ class QuizzesNext::QuizzesApiController < ApplicationController
       ].cache_key
 
       value = Rails.cache.fetch(cache_key) do
-        api_route = api_v1_course_quizzes_url(@context)
+        api_route = api_v1_course_all_quizzes_url(@context)
         @quizzes = Api.paginate(all_quizzes, self, api_route)
 
         {

spec/apis/v1/quizzes_next/quizzes_api_controller_spec.rb

@@ -152,6 +152,31 @@ describe QuizzesNext::QuizzesApiController, type: :request do
           end
         end
       end
+
+      context 'when there are multiple data pages' do
+        subject do
+          api_call(
+            :get,
+            "/api/v1/courses/#{@course.id}/all_quizzes?per_page=2",
+            controller: "quizzes_next/quizzes_api",
+            action: "index",
+            format: "json",
+            course_id: @course.id.to_s,
+            per_page: 2
+          )
+        end
+
+        it "include a response header Link" do
+          subject
+          link_header = response.headers['Link']
+          expect(link_header).to eq(
+            "<http://www.example.com/api/v1/courses/#{@course.id}/all_quizzes?page=1&per_page=2>; rel=\"current\","\
+            "<http://www.example.com/api/v1/courses/#{@course.id}/all_quizzes?page=2&per_page=2>; rel=\"next\","\
+            "<http://www.example.com/api/v1/courses/#{@course.id}/all_quizzes?page=1&per_page=2>; rel=\"first\","\
+            "<http://www.example.com/api/v1/courses/#{@course.id}/all_quizzes?page=4&per_page=2>; rel=\"last\""
+          )
+        end
+      end
     end
 
     context 'as a student' do