feat(ui): add links to review request targets in issue comments (#8239)

- Add links to review request targets in issue comments
- Fix links to ghost users/orgs/teams to be empty

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8239
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Robert Wolff <mahlzahn@posteo.de>
Co-committed-by: Robert Wolff <mahlzahn@posteo.de>

models/organization/org.go

@@ -186,6 +186,11 @@ func (org *Organization) CanCreateRepo() bool {
 	return org.AsUser().CanCreateRepo()
 }
 
+// IsGhost returns if the organization is a ghost
+func (org *Organization) IsGhost() bool {
+	return org.AsUser().IsGhost()
+}
+
 // FindOrgMembersOpts represensts find org members conditions
 type FindOrgMembersOpts struct {
 	db.ListOptions