Make AccountManagerService more resilient to database corruption.

Currently, if a user accounts database is corrupted, the system will crash and
boot loop.

This CL mitigates the issue by removing the user instead.

Bug: 145710595
Test: adb shell chmod 000 /data/system_de/10/accounts_de.db && adb reboot

Change-Id: I47916fde4577709a2555586b8dc94090605595bd
(cherry picked from commit 8472b904ecef69ee12818fa1f69458875a58c8df)