migrate_database_lmdb_to_rocksdb improvements #2107

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 8s
macOS [UBSAN] [lmdb \| clang]	40m 24s
Linux [ASAN] [lmdb \| clang]	40m 52s
macOS [ASAN] [lmdb \| clang]	31m 24s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	42m 19s
macOS [TSAN] [lmdb \| clang]	31m 32s
Linux [TSAN] [lmdb \| clang]	41m 10s
macOS [UBSAN] [rocksdb \| clang]	41m 20s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	41m 31s
macOS [ASAN] [rocksdb \| clang]	44m 1s
Linux [UBSAN] [rocksdb \| clang]	53m 37s
macOS [TSAN] [rocksdb \| clang]	50m 42s
Linux [ASAN] [rocksdb \| clang]	57m 57s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	54m 43s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	54m 25s
	11h 5m 5s

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