feat(provider/ecs): Added DestroyAsg pipeline stage (#4399)

* feat(provider/ecs): Added DestroyAsg pipeline stage

* Removed executionDetailsUrl property

* removed unused import

app/scripts/modules/ecs/pipeline/stages/destroyAsg/destroyAsgStage.html

@@ -0,0 +1,12 @@
+<div ng-controller="ecsDestroyAsgStageCtrl as destroyAsgStageCtrl" class="form-horizontal">
+  <div ng-if="!pipeline.strategy">
+    <account-region-cluster-selector
+      application="application"
+      component="stage"
+      accounts="accounts" >
+    </account-region-cluster-selector>
+  </div>
+  <stage-config-field label="Target">
+    <target-select model="stage" options="targets"></target-select>
+  </stage-config-field>
+</div>

app/scripts/modules/ecs/pipeline/stages/destroyAsg/destroyAsgStepLabel.html

@@ -0,0 +1,5 @@
+<span class="task-label">
+  Destroy Server Group:
+  {{step.context.serverGroupName}}
+  ({{step.context.region}})
+</span>

app/scripts/modules/ecs/pipeline/stages/destroyAsg/ecsDestroyAsgStage.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const angular = require('angular');
+
+import { StageConstants } from '@spinnaker/core';
+
+module.exports = angular.module('spinnaker.ecs.pipeline.stage.ecs.destroyAsgStage', [])
+  .config(function(pipelineConfigProvider) {
+    pipelineConfigProvider.registerStage({
+      provides: 'destroyServerGroup',
+      alias: 'destroyAsg',
+      cloudProvider: 'ecs',
+      templateUrl: require('./destroyAsgStage.html'),
+      executionStepLabelUrl: require('./destroyAsgStepLabel.html'),
+      accountExtractor: (stage) => [stage.context.credentials],
+      configAccountExtractor: (stage) => [stage.credentials],
+      validators: [
+        {
+          type: 'targetImpedance',
+          message: 'This pipeline will attempt to destroy a server group without deploying a new version into the same cluster.'
+        },
+        { type: 'requiredField', fieldName: 'cluster' },
+        { type: 'requiredField', fieldName: 'target', },
+        { type: 'requiredField', fieldName: 'regions', },
+        { type: 'requiredField', fieldName: 'credentials', fieldLabel: 'account'},
+      ],
+    });
+  }).controller('ecsDestroyAsgStageCtrl', function($scope, accountService) {
+
+    let stage = $scope.stage;
+
+    $scope.state = {
+      accounts: false,
+      regionsLoaded: false
+    };
+
+    accountService.listAccounts('ecs').then(function (accounts) {
+      $scope.accounts = accounts;
+      $scope.state.accounts = true;
+    });
+
+    $scope.regions = ['us-east-1', 'us-west-1', 'eu-west-1', 'us-west-2'];
+
+    $scope.targets = StageConstants.TARGET_LIST;
+
+    stage.regions = stage.regions || [];
+    stage.cloudProvider = 'ecs';
+
+    if (!stage.credentials && $scope.application.defaultCredentials.ecs) {
+      stage.credentials = $scope.application.defaultCredentials.ecs;
+    }
+    if (!stage.regions.length && $scope.application.defaultRegions.ecs) {
+      stage.regions.push($scope.application.defaultRegions.ecs);
+    }
+
+    if (!stage.target) {
+      stage.target = $scope.targets[0].val;
+    }
+
+  });
+