GraphQL: Rename CiRunnerJobExecutionStatus.RUNNING to ACTIVE

Once #469577 (closed) is implemented, RUNNING will actually mean ACTIVE, so we should rename that value (OK since the API is still marked as alpha).

  1. prepare the frontend to look for ACTIVE values from jobExecutionStatus
  2. once that change is deployed, rename RUNNING value in the CiRunnerJobExecutionStatus enum to ACTIVE (backend)
  3. clean up frontend code that deals with RUNNING value
Edited by Pedro Pombeiro