feat: Set `create_before_destroy` on subnet group #36

Job	Run time
Collect workflow inputs	3s
Max TF pre-commit	1m 2s
Min TF pre-commit (./modules/user-group)	27s
Min TF pre-commit (.)	23s
Min TF pre-commit (./modules/serverless-cache)	26s
Min TF pre-commit (./examples/redis-global-replication-group)	30s
Min TF pre-commit (./examples/redis-cluster-mode)	28s
Min TF pre-commit (./examples/redis-replication-group-with-cluster-replica)	27s
Min TF pre-commit (./examples/serverless-cache)	28s
Min TF pre-commit (./examples/redis-replication-group)	28s
Min TF pre-commit (./examples/valkey-replication-group)	24s
Min TF pre-commit (./examples/redis-cluster)	24s
Min TF pre-commit (./examples/memcached-cluster)	29s
	5m 59s

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