Backport: Fix password complexity check on registration (#8887) (#8888)

* Fix registration password complexity

* Fix integration to use a complex password ;)

integrations/signup_test.go

 	req := NewRequestWithValues(t, "POST", "/user/sign_up", map[string]string{
 		"user_name": "exampleUser",
 		"email":     "exampleUser@example.com",
-		"password":  "examplePassword",
-		"retype":    "examplePassword",
+		"password":  "examplePassword!1",
+		"retype":    "examplePassword!1",
 	})
 	MakeRequest(t, req, http.StatusFound)
 

routers/user/auth.go

 		ctx.RenderWithErr(ctx.Tr("auth.password_too_short", setting.MinPasswordLength), tplSignUp, &form)
 		return
 	}
+	if !password.IsComplexEnough(form.Password) {
+		ctx.Data["Err_Password"] = true
+		ctx.RenderWithErr(ctx.Tr("form.password_complexity"), tplSignUp, &form)
+		return
+	}
 
 	u := &models.User{
 		Name:     form.UserName,