Fixes #38251 - Make content view field ng-required on AK create

engines/bastion_katello/app/assets/javascripts/bastion_katello/activation-keys/new/views/activation-key-new.html

@@ -56,6 +56,7 @@ <h2 translate>New Activation Key</h2>
           <select ng-hide="contentViews.length === 0 || activationKey.environment === undefined "
                   id="content_view_id"
                   name="content_view_id"
+                  ng-required="activationKey.environment"
                   ng-model="activationKey.content_view_id"
                   ng-options="contentView.id as contentView.name for contentView in contentViews"
                   autofocus>
@@ -64,7 +65,7 @@ <h2 translate>New Activation Key</h2>
             The selected environment contains no Content Views, please select a different environment.
           </span>
           <span class="help-block" ng-show="activationKey.environment === undefined" translate>
-            Please select an environment.
+            Please select a lifecycle environment. Lifecycle environment and content view must be provided together.
           </span>
         </div>
       </span>