Convert swatch-producer-red-hat-marketplace jmx endpoint to REST

Per: https://docs.google.com/spreadsheets/d/1zwHxQ49Fzm-2zWyIJH5qDhRlhXe0uCL7woJ2dMcsoc8/edit#gid=0&fvid=601414088

Convert the following endpoint to rest based endpoints

• getUsageEventStatus(String batchId)

There is a branch that started the work (use or disregard as you like): https://github.com/RedHatInsights/rhsm-subscriptions/pull/2102