Fix release URL in webhooks (#27182) (#27185)

Backport #27182 by @jolheiser

Resolves #27180

`URL` points to the API URL, `HTMLURL` points to the web page.

Notably, however, for PRs they are the same URL. I switched them to use
HTMLURL to match the rest of the codebase terminology.

Co-authored-by: John Olheiser <john.olheiser@gmail.com>

services/webhook/msteams.go

@@ -290,7 +290,7 @@ func (m *MSTeamsPayload) Release(p *api.ReleasePayload) (api.Payloader, error) {
 		p.Sender,
 		title,
 		"",
-		p.Release.URL,
+		p.Release.HTMLURL,
 		color,
 		&MSTeamsFact{"Tag:", p.Release.TagName},
 	), nil