Table colocation does not check changes in pg_dist_node

Steps

1. Created a distributed table,
2. (Edited) Removed a worker by deleting a row from pg_dist_node
3. Created another distributed table

Result
New table is colocated with the old table, and shards are created on a removed worker.

Expected:
An error message, or anything other than creating shards on a worker that is not in the cluster.