Use FOR UPDATE when selecting ids in SqlIdGenerator
Seems we have collisions there, if a lot of items
are being created simultaneously.
Bug: T103796
Change-Id: Ifb5874e245f35f5239e1072f84e4d889f6614f75
(cherry picked from commit 2a0ac44f2e5f0121bb3a2c837fedc0e6f9098097)