[ES|QL] Editor does not work in an EuiPopOver

[thomasneirynck]

Kibana version:

main / 8.15

Describe the bug:

The ES|QL editor has a number of bugs in a pop-over.

1. The little icons (query history, docs, ...) on the bottom right are not clickable
2. The auto-complete box floats outside the editor

Steps to reproduce:

1. Embed the ES|QL-editor in an EuiPopOver
2. try to click one of the icons bottom-right, and notice they cannot be clicked. (changing the z-index of that group to 4 does make them clickable)
3. start typing a query and notice the autocomplete box floating outside.

Expected behavior:

The ES|QL editor behaves as expected.

Screenshots (if relevant):

1. Buttons are not clickable

Mouse-pointer is not showing in recording..

2. Autocomplete hovers off screen

[elasticmachine]

Pinging @elastic/kibana-esql (Team:ESQL)

[stratoula]

I am changing this to enhncement mostly because it ws nevr designed to work on popover (I find it a very bad UX) and it needs investigation and resources to work like that