label-actions: Add canned response for upgrade issues

Summary:
Enhance the label-actions config and support a "Type: Upgrade Issue" label.
- Point to the Upgrade Support repository whenever the Type: Upgrade Issue label is applied.
- Close the issue.

Changelog:
[Internal] label-actions: Add canned response for upgrade issues

Reviewed By: cpojer

Differential Revision: D20974607

fbshipit-source-id: 3cd7890aaeb1e57baf2acc5ca85a9b3ae5117c56