fix(aws-elasticloadbalancingv2): Set stickiness.enabled unless target type is lambda (#17271)

Avoid setting `stickiness.enabled` to `false` when the target group type is lambda as it breaks on deployment.

Fixes #17261.

----

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

Author: topecongiro

packages/@aws-cdk/aws-elasticloadbalancingv2-targets/test/integ.lambda-target.expected.json

@@ -404,12 +404,6 @@
     "LBListenerTargetsGroup76EF81E8": {
       "Type": "AWS::ElasticLoadBalancingV2::TargetGroup",
       "Properties": {
-        "TargetGroupAttributes": [
-          {
-            "Key": "stickiness.enabled",
-            "Value": "false"
-          }
-        ],
         "Targets": [
           {
             "Id": {

packages/@aws-cdk/aws-elasticloadbalancingv2/lib/alb/application-target-group.ts

@@ -166,6 +166,10 @@ export class ApplicationTargetGroup extends TargetGroupBase implements IApplicat
       const result = target.attachToApplicationTargetGroup(this);
       this.addLoadBalancerTarget(result);
     }
+
+    if (this.targetType === TargetType.LAMBDA) {
+      this.setAttribute('stickiness.enabled', undefined);
+    }
   }
 
   /**

packages/@aws-cdk/aws-elasticloadbalancingv2/test/alb/target-group.test.ts

@@ -20,6 +20,33 @@ describe('tests', () => {
     }).toThrow(/'vpc' is required for a non-Lambda TargetGroup/);
   });
 
+  test('Lambda target should not have stickiness.enabled set', () => {
+    const app = new cdk.App();
+    const stack = new cdk.Stack(app, 'Stack');
+
+    new elbv2.ApplicationTargetGroup(stack, 'TG', {
+      targetType: elbv2.TargetType.LAMBDA,
+    });
+
+    const tg = new elbv2.ApplicationTargetGroup(stack, 'TG2');
+    tg.addTarget({
+      attachToApplicationTargetGroup(_targetGroup: elbv2.IApplicationTargetGroup): elbv2.LoadBalancerTargetProps {
+        return {
+          targetType: elbv2.TargetType.LAMBDA,
+          targetJson: { id: 'arn:aws:lambda:eu-west-1:123456789012:function:myFn' },
+        };
+      },
+    });
+
+    expect(stack).not.toHaveResourceLike('AWS::ElasticLoadBalancingV2::TargetGroup', {
+      TargetGroupAttributes: [
+        {
+          Key: 'stickiness.enabled',
+        },
+      ],
+    });
+  });
+
   test('Can add self-registering target to imported TargetGroup', () => {
     // GIVEN
     const app = new cdk.App();