chore: ability to delete user in super admin console

fixes: #4164

app/models/user.rb

@@ -96,7 +96,7 @@ class User < ApplicationRecord
            class_name: :PortalMember,
            dependent: :destroy_async
   has_many :portals,
-           through: :portals_members,
+           through: :portal_members,
            class_name: :Portal,
            dependent: :nullify,
            source: :portal

config/routes.rb

@@ -346,7 +346,7 @@ Rails.application.routes.draw do
       resources :accounts, only: [:index, :new, :create, :show, :edit, :update] do
         post :seed, on: :member
       end
-      resources :users, only: [:index, :new, :create, :show, :edit, :update]
+      resources :users, only: [:index, :new, :create, :show, :edit, :update, :destroy]
       resources :access_tokens, only: [:index, :show]
       resources :installation_configs, only: [:index, :new, :create, :show, :edit, :update]
       resources :agent_bots, only: [:index, :new, :create, :show, :edit, :update]