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config: add `skip_replication_names` compat option

This patch fixes a bug when a Tarantool 3 instance configured via the
declarative config could not join a Tarantool 2 replica set if the
master snapshot did not contain instance and replica set names yet.

To address this, introduce a new compat option, `skip_replication_names`,
which controls instance and replica set name handling during replication
startup. In the `old` mode, Tarantool skips applying `instance_name` and
`replicaset_name` on startup and does not validate them against snapshot
data. In the `new` mode, Tarantool preserves the previous behavior and
applies and validates names on startup.

Closes #10426

NO_DOC=will added in separate PR

(cherry picked from commit 4e6123983)

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