feat(settings): introduce disable stack management setting (#4100)

* feat(stacks): add a setting to disable the creation of stacks for non-admin users

* feat(settings): introduce a setting to prevent non-admin from stack creation

* feat(settings): update stack creation setting

* feat(settings): fail stack creation if user is non admin

* fix(settings): save preventStackCreation setting to state

* feat(stacks): disable add button when settings is enabled

* format(stacks): remove line

* feat(stacks): setting to hide stacks from users

* feat(settings): rename disable stacks setting

* refactor(settings): rename setting to disableStackManagementForRegularUsers

* feat(settings): hide stacks for non admin when settings is set

* refactor(settings): replace disableDeviceMapping with allow

* feat(dashboard): hide stacks if settings disabled and non admin

* refactor(sidebar): check if user is endpoint admin

* feat(settings): set the default value for stack management

* feat(settings): rename field label

* fix(sidebar): refresh show stacks state

* fix(docker): hide stacks when not admin

app/docker/components/dockerSidebarContent/docker-sidebar-content.js

@@ -9,5 +9,6 @@ angular.module('portainer.docker').component('dockerSidebarContent', {
     toggle: '<',
     currentRouteName: '<',
     endpointId: '<',
+    showStacks: '<',
   },
 });

app/docker/components/dockerSidebarContent/dockerSidebarContent.html

@@ -8,7 +8,7 @@
     <a ui-sref="docker.templates.custom({endpointId: $ctrl.endpointId})" ui-sref-active="active">Custom Templates</a>
   </div>
 </li>
-<li class="sidebar-list">
+<li class="sidebar-list" ng-if="$ctrl.showStacks">
   <a ui-sref="docker.stacks({endpointId: $ctrl.endpointId})" ui-sref-active="active">Stacks <span class="menu-icon fa fa-th-list fa-fw"></span></a>
 </li>
 <li class="sidebar-list" ng-if="$ctrl.swarmManagement">