perf(database): avoid double cloning in take_n_reverts

[saylor-mik87786]

Replace split_at plus double to_vec with move-based split_off in take_n_reverts.

[codspeed-hq]

Merging this PR will not alter performance

✅ 177 untouched benchmarks

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_{Comparing saylor-mik87786:perf-database-take-n-reverts-no-double-clone (2b5cf5d) with main (4f0db36)}