… influence legacy format. (elastic#81123)

- Fixes a race condition where searches for data grid results with different parameters would return in different order with the wrong results on display. Fix uses a pattern to cancel useEffect callback for getIndexData().
- Fixes identifying pre 7.10 feature influence format for outlier detection and will display a callout on the results page with information for a workaround.
- To fix identifying the legacy format, some cleanup of other code relating to the old format had to be done. The ml results object field is no longer treated as a "special" field for outlier detection and is treated and retrieved in the same way as other fields.
- Adds an error callout if no Kibana index pattern is available for source/dest index.