Need to disable format-stress-pull-request-test and format-abort-recovery-stress-test instead of reverting WT-8372 in its entirety. These two tests are causing a bunch of CI failures, but they appear to be legitimate WT issues rather than issues with the mirroring change itself.

The ticket to track re-enabling format-abort-recovery-stress-test is WT-9767, and the ticket for format-stress-pull-request-test is WT-9770.