[Tooltip] Scroll subscription should be lazy

[andrewseguin]

Tooltip subscribes to the scroll dispatcher on init. Should move this to be done on show.

[noemi-salaun]

It looks like this was fixed in commit c8ec981 feat(overlay): add scroll handling strategies

[saulotoledo]

@andrewseguin @mmalerba Was this fixed in the commit mentioned above? If yes, I think this issue can be closed. :)

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