fdo#76324: Make pasting a lot of cell notes faster by disabling broadcasting.

Change-Id: If76e80af8dcecf70e4ea624a7f538023c48a5108
(cherry picked from commit e7a3aacff7d28577dee371ed5b27317522db7b3b)
Reviewed-on: https://gerrit.libreoffice.org/9710
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>