text: Title: [Task Manager] Old `performance` make code harder to maintain
  Body: Throughout Task Manager we have api calls made to the `performance` module, consumed by the `plugin_api_perf` test suite.
  
  Now that we have the Health monitoring endpoint and have made great strides in cloud based perf testing - I feel it's time top remove this suite and all the `performance` api calls, as they add a lot of noise in the TM code base that makes it harder to maintain.
  
  Additionally, these hooks are based on how TM worked a year ago, but aren't quite as useful now that the internal logic has changed. If we don't remove them, we should probably rethink how they are laid out to make them more useful.