Remove unnecessary attributes of User struct (#17745)

* Remove unnecessary functions of User struct

* Move more database methods out of user struct

* Move more database methods out of user struct

* Fix template failure

* Fix bug

* Remove finished FIXME

* remove unnecessary code

templates/org/home.tmpl

@@ -50,7 +50,7 @@
 				<div class="ui attached segment members">
 					{{$isMember := .IsOrganizationMember}}
 					{{range .Members}}
-						{{if or $isMember (.IsPublicMember $.Org.ID)}}
+						{{if or $isMember (call $.IsPublicMember .ID)}}
 							<a href="{{.HomeLink}}" title="{{.Name}}{{if .FullName}} ({{.FullName}}){{end}}">
 								{{avatar .}}
 							</a>