[popover2] Cannot tab to next element once popover was triggered

[jeremie-lucca]

In some contexts, once popover was triggered, it's not possible to escape the focus trap anymore, even if the popover has been close.
It appears that .cdk-overlay-container is not cleaned after closing the popover :

It can be reproduced on Basic view of popover2 Angular story : https://lucca-front.lucca.io/storybook/?path=/story/documentation-overlays-popover2-angular--basic

[obraud]

Note: luDialogs are correctly cleaned and I do not reproduce the focus issue with them

[obraud]

#3020

[jeremie-lucca]

#3021