Create a v2 snapshot when running etcdutl migrate command

Minor refactor on the etcdutl migrate command

Try to reproduce #19179

migrate flag experimental-compaction-batch-limit to use compaction-batch-limit

migrate flag experimental-compaction-batch-limit to use compaction-batch-limit

Create a v2 snapshot when running etcdutl migrate command

chore: enable unnecessary-stmt rule from revive

chore: enable early-return and superfluous-else from revive

Create a v2 snapshot when running etcdutl migrate command

Create a v2 snapshot when running etcdutl migrate command

Minor refactor on RaftCluster.Recover()

Rename migrate_command_test.go to common_test.go

Create a v2 snapshot when running etcdutl migrate command

add MemberDowngradeUpgrade failpoint

Switch from grpc-ecosystem/go-grpc-prometheus to grpc-ecosystem/go-grpc-middleware/providers/prometheus

tests/robustness/traffic: should use rev=0 for create

mvcc: restore tombstone index if it's first revision

mvcc: restore tombstone index if it's first revision