Fix random crashes in HID related code

Operation on characteristics/descriptors shouldn't access GATT database
when it's executed. This could happen while service rediscovery is in
progress.

Bug: 32240759
Test: connect to HID device
Change-Id: Ie2b6e6b451456204b1cea1e500df9a0ff949a9ef
(cherry picked from commit d8f09d077d9017a522c17f4b9a49328b0ed3e91e)