Always use atomic flushes in local-loglet #8211

All 44 tests pass, 1 skipped in 2m 31s

7 files ±0 7 suites ±0 2m 31s ⏱️ -50s
45 tests ±0 44 ✅ ±0 1 💤 ±0 0 ❌ ±0
172 runs - 2 169 ✅ - 2 3 💤 ±0 0 ❌ ±0

Results for commit c2e1960. ± Comparison against earlier commit 423c8bc.