Fix cf_consistency_stress for backup/restore, harmonize #7373
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Summary: We can only check key on restored backup if in a stress test
configuration locking the key. (Fixes mismatch seen in backup/restore
with atomic flush.)
TestCheckpoint used a very ugly solution to the same problem: copy-paste
dozens of lines of code with some changes and removals. I removed the
unnecessary implementation and made the existing one simply adaptive,
like TestBackupRestore.
Also made TestBackupRestore clean up dead backup/restore directories on
success.
Test Plan: blackbox_crash_test_with_atomic_flush for a while,
blackbox_crash_test for a while, with backup and checkpoint 1 in 5k and
only 1k max_keys to stress this area