Remove IDPE-me reducer and state

The IDPE 'me' state and reducer are supplanted by the quartz/identity reducer and state. The `quartzMe` state has already been removed from the IDPE `me` state, so all that is left are the `id` and `name` properties already provided by quartz in cloud environments. The old IDPE 'me' reducer and state should be removed, with the cloud version of the app solely using quartz and not idpe for this data.

In cloud environments, this data will be provided by quartz endpoints (/quartz/identity)

In OSS environments, the existing route should be hit, but the data maintained in the same identity state.