Use default serialization settings if serialization_settings is None

[pingsutw]

Tracking issue

NA

Why are the changes needed?

Failed to register a workflow when serialization settings is None

            if create_default_launchplan:
                if not og_entity:
                    raise user_exceptions.FlyteValueException(
                        "To create default launch plan, please pass in the original flytekit workflow `og_entity`"
                    )
    
                # Let us also create a default launch-plan, ideally the default launchplan should be added
                # to the orderedDict, but we do not.
                self.file_access._get_upload_signed_url_fn = functools.partial(
>                   self.client.get_upload_signed_url, project=settings.project, domain=settings.domain
                )
E               AttributeError: 'NoneType' object has no attribute 'project'

What changes were proposed in this pull request?

Create a default serialization settings if it's None

How was this patch tested?

@task(container_image=image_spec)
def t2(second: int):
    sleep(second)


@workflow
def wf(second: int = 60):
    for i in range(10):
        t2(second=second)

flyte_workflow = remote.register_workflow(
        entity=wf, version=version
    )
    exe = remote.execute(
        entity=flyte_workflow, inputs={}, wait=False, options=Options(max_parallelism=3)
    )

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

NA

Docs link

NA