Python: change order used to check variants in (de)ser steps (#10051)

### Motivation and Context

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While reviewing the docs, noticed some illogical behavior, this fixes
that.

### Description

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### Contribution Checklist

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- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

python/semantic_kernel/data/vector_storage/vector_store_record_collection.py

@@ -518,10 +518,10 @@ def _serialize_data_model_to_dict(self, record: TModel, **kwargs: Any) -> OneOrM
         """
         if self.data_model_definition.to_dict:
             return self.data_model_definition.to_dict(record, **kwargs)
-        if isinstance(record, BaseModel):
-            return self._serialize_vectors(record.model_dump())
         if isinstance(record, ToDictMethodProtocol):
             return self._serialize_vectors(record.to_dict())
+        if isinstance(record, BaseModel):
+            return self._serialize_vectors(record.model_dump())
 
         store_model = {}
         for field_name in self.data_model_definition.field_names:
@@ -611,14 +611,14 @@ def _deserialize_dict_to_data_model(self, record: OneOrMany[dict[str, Any]], **k
                     "Cannot deserialize multiple records to a single record unless you are using a container."
                 )
             record = record[0]
-        if issubclass(self.data_model_type, BaseModel):
-            if include_vectors:
-                record = self._deserialize_vector(record)
-            return self.data_model_type.model_validate(record)  # type: ignore
         if func := getattr(self.data_model_type, "from_dict", None):
             if include_vectors:
                 record = self._deserialize_vector(record)
             return func(record)
+        if issubclass(self.data_model_type, BaseModel):
+            if include_vectors:
+                record = self._deserialize_vector(record)
+            return self.data_model_type.model_validate(record)  # type: ignore
         data_model_dict: dict[str, Any] = {}
         for field_name in self.data_model_definition.fields:
             if not include_vectors and field_name in self.data_model_definition.vector_field_names: