Retry reading db hash if canceled

When there are multiple clients connected to
a remote device and the client reading db hash
is closed, other clients stuck in DISCOVER state.

With this CL, it notifies failure of discovery and
enable them to restart discoverye
to continue discovery.

Bug: 331819748
Bug: 335082571
Test: atest BluetoothInstrumentationTests
Change-Id: I53950c14208ec56c8139318a1312ab95ab540664