Exploratory View Polish

[paulb-elastic]

Carried over from https://github.com/elastic/uptime-dev/issues/51

• Use EUI viz colors for charts
• Use sentence case and abbreviations for legends and tooltips (for example: currently it says "Secondes" where it could be "s") (fixed in [Exploratory View] Use human readable formats kibana#101520)
• Currently the reports produce charts with different heights, it should be the same height for all charts
• the unit should be dependent on the number, for example instead of "26000 Milliseconds", it should say "26 s" (fixed in [Exploratory View] Use human readable formats kibana#101520)

Carried over from elastic/kibana#98602

The context menu/popover for the filtering doesn't look like the EuiContextMenu on the navigation titles
The context menu / popover styling deviates from the original component with not using the title option to display the selected group and back options. I consider this an enhancement if needed.

View screens

Responsive layout: Perhaps not necessary for experimental, but if possible it'd be nice if the definition options would just vertically align instead of the horizontal layout for smaller screens (below 1024px)

View screens

Small enhancement: Use the same chart options display as in Lens
The Lens app displays the chart options simply as a group button option instead of the selector.

View example

[shahzad31]

Relevant issues are fixed and remaining will not be relevant after redesign

[justinkambic]

I checked the various polish items locally and they seem to be looking good.