EuiFocusTrap causes relayout cycles

[flash1293]

As discovered in elastic/kibana#85430,

if EuiFocusTrap is used, additional HTML elements are introduced and changed in some cases, triggering a layout cycle which can cause problems in other components:

• elastic-charts components can "twitch" a little (probably because a resize observer is triggered)
• In firefox, scrollbars flash briefly

cc @chandlerprall

[chandlerprall]

Marking as needing triage because the extra DOM elements are expected when enabling the focus trap. This may end up being a change in EUI (e.g. exposing a prop) or providing implementation guidance.

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[github-actions]

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