Before this commit, pasting a URL as plain text followed by picking
"Embed Youtube Video" in the command bar failed to embed the video,
inserting the following text instead: "[object Promise]".
This happened because [1], which is the result of a forward-port, failed
to `await` the call to getYoutubeVideoElement, which is an async
function since version 15.2.
[1]: https://github.com/odoo/odoo/commit/c2f0519fec40dcf529218f39829e0a09c0f7af69
task-3611566
closesodoo/odoo#146653
X-original-commit: 4891359210e2f921dbfb6d7c870ec5cf1b60d3f5
Signed-off-by: Nicolas Bayet (nby) <nby@odoo.com>