BLASTSyncEngine: Logging and trace around commit timeout

No reason to think this is happening at the moment, but if it
were to start happening (say because SysUI stopped applying
a transaction), we would want to be able to find out what is
happening as soon as possible!

Bug: 227357300
Test: Existing tests pass
Change-Id: I4e00942169c56890f842c1f03737a15d07fb4cdf