[ews-app] Add comment_id field in django app database to save github comment id.
Pull request: https://github.com/WebKit/WebKit/pull/2848
Committed 252998@main (3f069cd6ed78): <https://commits.webkit.org/252998@main> Reviewed commits have been landed. Closing PR #2848 and removing active labels.
<rdar://problem/97917888>