libbluetooth: Add BT_STATUS_DEVICE_NOT_FOUND metric

Add granularity to BT_STATUS_FAIL error codes by introducing a new
BT_STATUS_DEVICE_NOT_FOUND metric, to be used when an effort to find a
device by address or other identifier fails.

Bug: 340296381
Test: m -j
Flag: Exempt, metrics-only change
Change-Id: I22664bfd3e26242803b8b996a813e93011f32d16