* Reflects the changes to transform stats on the ES side in elastic/elasticsearch#45276
* Updated mock __mocks__/data_frame_transform_list_row.json to reflect the new stats structure
* Previously there were stats attributes task_state and indexer_state, now there is only state.
* Renamed DATA_FRAME_TASK_STATE to DATA_FRAME_TRANSFORM_STATE .
* Extended possible states to aborting, failed, indexing, started, stopped, stopping.
* A stopped batch transform's stats no longer returns the progress until it was stopped. Instead of falling back and showing 0% with an empty progress bar, nothing will be shown. If the job is continued and returns progress again, the progress bar will also be shown again.
* The expanded row's details tab now exposes hard-coded stats/state attributes instead of inferring attributes dynamically from objects. This was done so we can do custom formatting for date fields for example.

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