config: new `skip_replication_names` compat option

Related dev. issue(s): https://github.com/tarantool/tarantool/pull/12196

Product: Tarantool
Since: product version
Audience/target: who will read it and for what task?
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/compat/#options
SME: @mandesero @georgiy-belyanin

Details

The compat.skip_replication_names option controls whether Tarantool skips instance and replicaset name handling during replication startup.

• new (3.x default): Tarantool applies instance_name and replicaset_name on startup and validates them against the snapshot data.
• old (2.x default): Tarantool skips applying instance_name and replicaset_name on startup and does not validate them against the snapshot data. This mode is intended for upgrades from Tarantool 2.11, so a Tarantool 3.x+ instance configured via the declarative config can join a 2.11-compatible replicaset where the master snapshot may not contain names.

Open the root document at reference/reference_lua/compat/#options and review how compatibility options are described. Use the related development pull request for context, then document skip_replication_names with its new and old behavior and upgrade purpose; done means the option is clearly covered in the compatibility reference.