When the RRFaM behavior is enabled:

• A primary executing the update can add an update to the SessionTxnRecord within the same WUOW.
• A secondary applying the update can also add an update to the SessionTxnRecord within the same WUOW.
  • Right now the UpdateResult does not return the pre/post image. This ticket should expose that API.
  • However the update predicate must include the clause: `{txnNum: {$lt: <updated txnNum>`}}.
• Remove noop oplog entry writes for FaM updates
• Take care to leave the upsert path alone (pre/post images are already trivially replicated)
• Collections configured to always store preImages must continue to write noop pre-image oplog entries.
  • A findAndModify against these collections should avoid also saving the preImage into a config.transactions document.