Add a check in salvage when no overflow items are found

format-stress-pull-request-test failed on ! Ubuntu 18.04 UBSAN

Host: ec2-3-239-215-13.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: Revert "WT-7989 Compact quits when running at the same time as a system checkpoint (#6961)" (#6976)

This reverts commit bb38040287ca820da9f6724d7523e722d0226769. | 07 Sep 21 06:06 UTC
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Task Logs (format-stress-pull-request-test)

EDIT: The issue described above will be fixed in WT-8198. This ticket addresses an issue related to salvage.