[Feature] [flytekit] FlyteRemote listing of workflows and launch plans

[wild-endeavor]

Motivation: Why do you think this is important?
This issue is a continuation of #1290. That PR only provided for the listing of tasks and executions.

The reason for this is because of the promote_from_model logic for FlyteWorkflow and FlyteLaunchPlan.

For workflows, when promoting from model, we also need the definition of any launch plan nodes.

@classmethod
    def promote_from_model(
        cls,
        base_model: _workflow_models.WorkflowTemplate,
        sub_workflows: Optional[Dict[_identifier.Identifier, _workflow_models.WorkflowTemplate]] = None,
        node_launch_plans: Optional[Dict[_identifier.Identifier, _launch_plan_models.LaunchPlanSpec]] = None,
        tasks: Optional[Dict[_identifier.Identifier, _task_models.TaskTemplate]] = None,
    ) -> "FlyteWorkflow":

For FlyteLaunchPlan, fetching implies
https://github.com/flyteorg/flytekit/blob/b49578b931bf092f7f8ea743abe3ca4a46466f18/flytekit/remote/remote.py#L400-L403
technically also implies the fetching of the underlying workflow for completion's sake.

We can't get all this information today from one Admin call. That means that listing 100 workflows could trigger a whole ton of requests to Admin. This is a separate ticket because we should think about whether there's a better way of doing this.

[github-actions]

Hello 👋, this issue has been inactive for over 9 months. To help maintain a clean and focused backlog, we'll be marking this issue as stale and will engage on it to decide if it is still applicable.
Thank you for your contribution and understanding! 🙏