BE: Allow users to edit the labels of a Jira issue on details page

Description

This issue could be considered the second part of the other backend issue #330778 (closed) and also corresponds with the frontend issue #328787 (closed).

  1. The user selects the labels in the UI.
  2. Make a request to update the Jira labels selected on the Jira details page.

Screen_Shot_2021-05-12_at_17.15.00