Fix command url validation (#15239)

* Fix command url validation

* Add Host and Scheme check in IsValidHttpUrl func

* Add unit tests

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/utils.go

@@ -496,7 +496,7 @@ func IsValidHttpUrl(rawUrl string) bool {
 		return false
 	}
 
-	if _, err := url.ParseRequestURI(rawUrl); err != nil {
+	if u, err := url.ParseRequestURI(rawUrl); err != nil || u.Scheme == "" || u.Host == "" {
 		return false
 	}