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perf: avoid per-row snapshot hash tuple copy #444

Job	Run time
Dolt 2.2.2 default-write integration	1m 18s
Dolt 2.2.3 default-write integration	1m 10s
MySQL 8.4.11 integration	1m 26s
MariaDB 11.4.12 integration	1m 5s
test (3.13)	1m 53s
Build and install package artifact	1m 11s
MariaDB 12.3.2 integration	1m 12s
PostgreSQL 18.4 integration	1m 22s
test (3.14)	2m 12s
PostgreSQL 17.10 integration	1m 29s
MariaDB 11.8.8 integration	1m 8s
test (3.12)	2m 2s
MySQL 9.7.2 integration	1m 51s
test (3.11)	2m 25s
	21m 44s