[FIX] web_editor: fix overlay cover on infinitely animated elements

Before this commit, the overlay cover operation was deferred while an
animation was ongoing on the target element. The problem was that the
animation end event is not triggered if the related DOM is removed
before the animation ends... or simply if the animation is infinite.
When this occured, the overlay never appeared.

Note: this could probably be backported if the need rises.

Part of https://github.com/odoo/odoo/pull/36803
task-2070930

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