unit-test-long failed on ! Ubuntu 18.04

Host: ec2-54-208-43-88.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-7783 Fix RTS to restore tombstone when an on-disk update is out of order prepared (#6751)

When an out of order prepared update is inserted, as part of reconciliation
the earlier updates don't get corrected when it is written to the data store.
While aborting these out of order prepared updates by RTS, it missed restoring
the tombstone from the history store when its stop timestamp is greater than
the on-disk update timestamp. | 06 Jul 21 10:56 UTC
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Task Logs (unit-test-long)