ycb_cockroach_c5d8fb2dede04

what a new run launched now would send

ALTER DOMAIN ... SET SCHEMA currently fails with FeatureNotSupported. Implement it so a domain can be moved to another schema.

Match the semantics already used for ALTER TYPE ... SET SCHEMA on user-defined types that have an associated implicit array type:
- Moving the domain must also move its implicit array type into the target schema.
- If the domain is already in the target schema, the statement is a no-op.
- Reject temporary/virtual target schemas, unknown schemas, and name conflicts in the target schema (for both the domain and its array type).
- A domain still referenced by a table column (by descriptor ID) must remain usable after the move.
- Emit the usual set_schema DDL event, with the descriptor type reflecting that a domain was moved.

Add/update declarative schema changer and SQL logic coverage so SET SCHEMA for domains is exercised end-to-end (success paths, errors, and array-type relocation), not left as an unsupported stub.

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

When you are done, leave your changes committed or in the working tree;
they are collected automatically.

Stay on this snapshot checkout (`task/ycb_cockroach_c5d8fb2dede04`). Never checkout, pull, or rebase onto `main`. That branch is a README-only orphan.
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