Do not start picker sync when cloud provider changes

Currently picker sync blocks fetching/updating cloud provider and as a
result Picker crashes when we try to launch the PhotoPickerActivity
when a background sync is happening. To mitigate this issue, remove
the picker sync trigger when we change the cloud provider till we can
safely handle this.

Bug: 264999862
Test: Does not ANR on test device.
Change-Id: I6e0480c717d24726bc895ae60ba149e25de5bfed
2 files changed