Issue #3276714: Refactor BDD test feature files for k8s module

modules/cloud_service_providers/k8s/tests/src/Behat/features/templates/K8s-ATDD-00-01-CreateCloudServiceProvider.feature

+Feature: Create a cloud service provider for K8s as "Cloud administrator"
+  In order to start BDD testing
+  We need to create a cloud service provider
+
+  @api
+  Scenario: Add a K8s Cloud service provider
+    Given I am logged in as a user with the "Cloud administrator" role
+    When I visit "/admin/structure/cloud_config/add/k8s"
+    And I enter "{{ k8s_cloud_service_provider_name_entered }}" for "Name"
+    And I enter "{{ api_server }}" for "API server"
+    And I enter "{{ api_server_token }}" for "Token"
+    And I press "Save"
+    Then I should be on "/admin/structure/cloud_config"
+    And I should see "has been created"
+    And I should see K8s in the "{{ k8s_cloud_service_provider_name }}" row