[FIX] website: only stop clone's animations on cloning

/!\ Should not be forward-ported ! As further explained, this commit is
/!\ only partial backports of 12.0 commits. All conflicts should be
/!\ ignored.

A recently merged PR https://github.com/odoo/odoo/pull/35029 was in
fact developed for 12.0 originally and finally merged in 11.0 to solve
potential same bugs. The problem is that one line of that merge relied
on a 12.0 feature that is missing in 11.0: the ability to stop
animations *on part of the DOM only*.

This commit chose to backport that 12.0 feature instead of retargeting
the original PR as it will be needed for another unrelated fixes. So,
this commit partially backport those commits:
- https://github.com/odoo/odoo/commit/0a31cb9b4ae461119ecafdd05c5b979621ffb039
- https://github.com/odoo/odoo/commit/b56e647f2c540d34860cdee8a6adf0785ce3b8ef

(Only the stop animation ability part, not the way it was used).

Note that the first commit was already partially backported with
https://github.com/odoo/odoo/commit/59e1bdff221f4a099f6000eb9884f84f772c38bb

closes odoo/odoo#35230

Signed-off-by: Romain Derie (rde) <rde@odoo.com>

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