fix: DTOData bug with renamed fields

[abdulhaq-e]

Pull Request Checklist

• New code has 100% test coverage
• (If applicable) The prose documentation has been updated to reflect the changes introduced by this PR
• (If applicable) The reference documentation has been updated to reflect the changes introduced by this PR

Description

Implementing a fix for DTOData #2065 introduced a new bug. Originally, fields passed to DTOData.create_instance were handled using their serialized names. For example, when using camel case for an excluded field entity_id, data.create_instance(entityId="1") would work but data.create_instance(entity_id="A") wouldn't. That was not ideal so the erroneous fix was to ignore serialized field names altogether when dealing with DTOData. Here is an example of why this would fail:

@dataclass
class User):
    entityId: str
    firstName: str

@post(
    dto=DataclassDTO[Annotated[User, DTOConfig(exclude={"entity_id"}, rename_strategy="camel")]],
)
def handler(data: DTOData[User]) -> User:
    result = data.create_instance(entity_id="123")
    return result

Since. #2065 ignored serialized names, the above example will fail to deserialize b'{firstName: "J"}'. The fix: only override serialization names when using data.create_instance, otherwise, when dealing with DTOData we should use the serialization name (to successfully deserialize)

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Documentation preview will be available shortly at https://litestar-org.github.io/litestar-docs-preview/2144