Alert user with text if startDate > endDate

[Rperry2174]

We have a new DatePicker dropdown, but now its easier to accidentally choose an endDate that is smaller than startDate. When state.startDate > state.endDate then we should add some red text to the bottom to alert the user that they have an invalid date range.

This way they will not accidentally wait for the data to update for an invalid date range.

i can fix this.

[petethepig]

This is an example from grafana