* refactor aliasBy and PopoverCtrl components

* refactor Aggregations component

* refactor MetricSelect component

* refactor UserProvider

* popoverCtr: remove redundant logic

* simplified the MetricsSelect a bit.

* skipping testing of internal component logic.

* changed to componentWillMount.

* changed elapsed time to a functional component.

* rewrote the tests.

* fixed missing test title.

* fixed a tiny issue with elapsed time.

* rename of field.

Co-authored-by: Marcus Andersson <marcus.andersson@grafana.com>