feat(resync): Add support to update snapshot config (max_parallel_workers, num_tables, rows_per_partition) during resync signal #19272

Job	Run time
flow_test (ubuntu-latest-16-cores, 16, mysql-gtid, 6.0, lts)	15m 52s
flow_test (ubuntu-latest-16-cores, 18, maria, 8.0, latest)	16m 18s
flow_test (ubuntu-latest-16-cores, 17, mysql-pos, 7.0, stable)	17m 33s
flow_test (ubuntu-latest-16-cores, 17, mysql-pos, 7.0, stable)	16m 41s
flow_test (ubuntu-latest-16-cores, 16, mysql-gtid, 6.0, lts)	15m 56s
flow_test (ubuntu-latest-16-cores, 18, maria, 8.0, latest)	16m 18s
	1h 38m 38s

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