dbt-materialize: Stop adding aliases to subqueries with --empty (#27522)

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### Motivation

As per this bug
[here](dbt-labs/dbt-adapters#124), the
`--empty` flag doesn't work with relation that are already named and
fails.

A quick repro:
* Create a simple model with: `SELECT * FROM {{
ref('my_upstream_model')}} some_alias`
* The generated SQL when using the `--empty` flag, looks like this:
```sql
as (
  SELECT * FROM (
    select * from "my_upstream_model" where false limit 0) _dbt_limit_subq_my_upstream_model alias
);
```

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### Checklist

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considered. ([trigger-ci for additional test/nightly
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misc/dbt-materialize/CHANGELOG.md

@@ -4,6 +4,7 @@
 
 * Add support for overriding the `generate_cluster_name` macro to customize the
   cluster name generation logic in user projects.
+* Stop adding aliases to subqueries when calling with `--empty` flag.
 
 ## 1.8.0 - 2024-05-23
 

misc/dbt-materialize/dbt/adapters/materialize/relation.py

@@ -44,6 +44,7 @@ class MaterializeRelationType(StrEnum):
 @dataclass(frozen=True, eq=False, repr=False)
 class MaterializeRelation(PostgresRelation):
     type: Optional[MaterializeRelationType] = None
+    require_alias: bool = False
 
     # Materialize does not have a 63-character limit for relation names, unlike
     # PostgreSQL (see dbt-core #2727). Instead, we set 255 as the maximum

misc/dbt-materialize/tests/adapter/test_empty.py

@@ -13,8 +13,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from dbt.tests.adapter.empty.test_empty import BaseTestEmpty
+from dbt.tests.adapter.empty.test_empty import (
+    BaseTestEmpty,
+    BaseTestEmptyInlineSourceRef,
+)
 
 
 class TestMaterializeEmpty(BaseTestEmpty):
     pass
+
+
+class TestMaterializeEmptyInlineSourceRef(BaseTestEmptyInlineSourceRef):
+    pass