These changes make the map work better with auto-refresh and with dragged nodes.

Extract all event handling out of the Cytoscape component into a hook.
Use React.memo to only render when the list of element ids has changed.
Only do a fit on the layout if we're going from 0 to more than 0 elements.
Instead of removing all the nodes on rerender, only remove the ones that aren't in the new list.
Trigger a custom:data event instead of data when we receive fetched data. Before we triggered a data event which would trigger a layout if you called data() on an element.
Don't trigger a deselect when we get new data, so popovers stay open when we get new data.
Animate the layout on changes.
When we do a layout, exclude selected nodes and nodes that have been dragged.
When we set the time range to something low (like the default of 15m) and a fast refresh interval (1-3s) the edges we get back from the API are not consistent, so you can see the map changing frequently.

See this video for an example: https://www.dropbox.com/s/jsq2bffxdw61xhu/77132.mov?dl=0

Fixes elastic#73156.
Fixes elastic#76936.