fix(ecs): DeploymentAlarms property is specified for ECS service with CODE_DEPLOY and EXTERNAL deployment controller (#26317)

From #25840, ECS L2 construct sets the default configuration for the `CfnService.deploymentConfiguration.alarms` property to:
```
alarmNames: [],
rollback: false,
enable: false,
```

However, alarm based rollback feature is only supported for ECS services that use the rolling update (ECS) deployment controller.
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/deployment-alarm-failure.html

Due to this limitation, when deploymentController is set to CODE_DEPLOY or EXTERNAL, creation for the service will fail by conflict with `deploymentConfiguration.alarms` property.

This PR solves the issue by skipping to set default configuration for the `CfnService.deploymentConfiguration.alarms` property for CODE_DEPLOY and EXTERNAL deployment controller.

Closes #26307

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: tam0ri

packages/@aws-cdk-testing/framework-integ/test/aws-codedeploy/test/ecs/integ.deployment-group.js.snapshot/aws-cdk-codedeploy-ecs-dg.assets.json

@@ -1,15 +1,15 @@
 {
   "version": "32.0.0",
   "files": {
-    "146a3a0178544a80f025b470e820a77ec783a43b2a5ae0a2590037423ed16a6b": {
+    "54ea34edd18b9383781f88fd1ab5487b7d2a4ca076f0a365fa77e3b3a4b109d9": {
       "source": {
         "path": "aws-cdk-codedeploy-ecs-dg.template.json",
         "packaging": "file"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "146a3a0178544a80f025b470e820a77ec783a43b2a5ae0a2590037423ed16a6b.json",
+          "objectKey": "54ea34edd18b9383781f88fd1ab5487b7d2a4ca076f0a365fa77e3b3a4b109d9.json",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }

packages/@aws-cdk-testing/framework-integ/test/aws-codedeploy/test/ecs/integ.deployment-group.js.snapshot/aws-cdk-codedeploy-ecs-dg.template.json

@@ -449,11 +449,6 @@
      "Ref": "EcsCluster97242B84"
     },
     "DeploymentConfiguration": {
-     "Alarms": {
-      "AlarmNames": [],
-      "Enable": false,
-      "Rollback": false
-     },
      "MaximumPercent": 200,
      "MinimumHealthyPercent": 50
     },

packages/@aws-cdk-testing/framework-integ/test/aws-codedeploy/test/ecs/integ.deployment-group.js.snapshot/manifest.json

@@ -17,7 +17,7 @@
         "validateOnSynth": false,
         "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-deploy-role-${AWS::AccountId}-${AWS::Region}",
         "cloudFormationExecutionRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-cfn-exec-role-${AWS::AccountId}-${AWS::Region}",
-        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}/146a3a0178544a80f025b470e820a77ec783a43b2a5ae0a2590037423ed16a6b.json",
+        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}/54ea34edd18b9383781f88fd1ab5487b7d2a4ca076f0a365fa77e3b3a4b109d9.json",
         "requiresBootstrapStackVersion": 6,
         "bootstrapStackVersionSsmParameter": "/cdk-bootstrap/hnb659fds/version",
         "additionalDependencies": [