[ews-app] Save pr_id and pr_project in django app database.
Pull request: https://github.com/WebKit/WebKit/pull/2847
Committed 252951@main (1c5f01009859): <https://commits.webkit.org/252951@main> Reviewed commits have been landed. Closing PR #2847 and removing active labels.
<rdar://problem/97788010>