Move user related model into models/user (#17781)

* Move user related model into models/user

* Fix lint for windows

* Fix windows lint

* Fix windows lint

* Move some tests in models

* Merge

modules/context/org.go

@@ -52,7 +52,7 @@ func HandleOrgAssignment(ctx *Context, args ...bool) {
 	var err error
 	ctx.Org.Organization, err = models.GetOrgByName(orgName)
 	if err != nil {
-		if models.IsErrUserNotExist(err) {
+		if user_model.IsErrUserNotExist(err) {
 			redirectUserID, err := user_model.LookupUserRedirect(orgName)
 			if err == nil {
 				RedirectToUser(ctx, orgName, redirectUserID)
@@ -108,7 +108,7 @@ func HandleOrgAssignment(ctx *Context, args ...bool) {
 		}
 	} else {
 		// Fake data.
-		ctx.Data["SignedUser"] = &models.User{}
+		ctx.Data["SignedUser"] = &user_model.User{}
 	}
 	if (requireMember && !ctx.Org.IsMember) ||
 		(requireOwner && !ctx.Org.IsOwner) {