Automatic merge from branch-5.5

* origin/branch-5.5:
  SONAR-7553 use api/ce/activity_status to get number of pending and failing tasks
  SONAR-7553 WS api/ce/activity_status display background tasks related metrics for UI
  SONAR-7553 DAO of CE_QUEUE count number of rows by status
  SONAR-7553 DAO of CE_ACTIVITY count number of tasks still failing
  SONAR-7187 WS api/ce/activity stop using count(1) on DB table CE_QUEUE
  SONAR-7553 Create composite DB index CE_ACTIVITY(is_last, status)
  SONAR-7187 do not usage pagination
  SONAR-7187 Remove paging from api/ce/activity

diff --cc server/sonar-web/src/main/js/apps/background-tasks/store/reducers.js
Simple merge