Fix some flaky tests in BackupableDBTest with intentional flushing #7273
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Summary: Some tests like BackupableDBTest.FileCollision and
ShareTableFilesWithChecksumsNewNaming are intermittently failing,
probably due to unpredictable flushing with FillDB. This change
should fix the failures seen and help to prevent similar flakiness in
future tests in the file.
Test Plan: make check, and with valgrind