TISTUD-5101 Improve Github PR submission
  - Add overview section to dialog showing the two endpoints the PR would be fore
  - set a preferred width for the body text control
  - submit the PR in a user job
  - grab the returned JSON and generate a model object holding it
  - Use the PR model object to populate a more helpful toast for success which allows user to click to open browser on PR they just submitted.
Merge pull request #70 from sgtcoolguy/TISTUD-5101

TISTUD-5101 Improve Github PR submission