[ews] Update the icon and text style for cancelled builds in EWS GitHub comments.
Pull request: https://github.com/WebKit/WebKit/pull/3047
Committed 253151@main (ad20c78ad514): <https://commits.webkit.org/253151@main> Reviewed commits have been landed. Closing PR #3047 and removing active labels.
<rdar://problem/98201266>