Summary
Print the key that is rolling back as part of the RTS verbose log messages.

Motivation
Printing the key along with the time window information helps in debugging whenever there is a data mismatch or data corruption problem occurs.

Acceptance Criteria (Definition of Done)
Print the key as part of the verbose logs whenever the data store key is replaced with a stable version from the history store or removed or rolling back its removal operation. Do not print the key for the stable updates.