Add GET extra links endpoint to REST API

[bbovenzi]

Description

Add a REST API endpoint for extra links on a task instance like so:

GET /api/v1/dags/{dag_id}/dagRuns/{dag_run_id}/taskInstances/{task_id}/extraLinks/{link_name}

We should probably be able to send multiple link_names or if it is omitted we can receive an array of all extra links for that task instance.

[
  {
     name: "google",
     url: "google.com"
  }
]

Use case/motivation

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[bbovenzi]

Nevermind, this already exists.