Ignore invalid compaction job commits in a transaction

[rtjd6554]

Background

Split from:

• Unordered batch commit queue for compaction jobs #3686

Description

We'll need to adjust how compaction commit transactions are applied so that any invalid commits are discarded, and the transaction as a whole is still applied, so that if a job is run more than once we ignore the second run. If this results in an empty transaction we can just not add it to the log.

Analysis

Compaction commits could be invalid for a various reasons:
If input files no longer exists, (likely due to already have been committed earlier) that commit can be ignored,
If input files exists but aren't assigned to job, want to log the event out but all for the compactions to continue (i.e. not an exception)