validator package does not assume a odoo.addons package name, provide full package name instead

tests/schemas/__init__.py

+import json
+import pkgutil
+from typing import Optional, Any
+
+
+def get_schemas() -> list[Any]:
+    for file_prefix in ("product",):
+        data: bytes | None = pkgutil.get_data(__name__, f"{file_prefix}.schema.json")
+        if data:
+            yield json.loads(data)