R1:2b19f91936f2

Allow Doorkeeper references to have multiple display variations (full, short, etc.)

Summary:
Ref T13102. An install has a custom rule for bridging JIRA references via Doorkeeper and would like to be able to render them as `JIRA-123` instead of `JIRA JIRA-123 Full JIRA title`.

I think it's reasonable to imagine future support upstream for `JIRA-123`, `{JIRA-123}`, and so on, although we do not support these today. We can take a small step toward eventual support by letting the rendering pipeline…