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config: add error on the same instance names

Tarantool couldn't start with more than one group/replicaset/instance
with the same name. Applying cluster configuration with name duplicates
results with failed checks during the config application and violated
constraints w/o proper error message.

This patch makes Tarantool throw a proper error when it has instances
with the same name in different replicasets in the cluster
configuration.
Here is an example of such configuration:
```yaml
groups:
  g-001:
    replicasets:
      r-001:
        instances:
          i-001: {}
      r-002:
        instances:
          i-001: {}
```

Closes #10347

NO_DOC=bugfix

(cherry picked from commit 5d57e6508)

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