fix(core): incorrect CloudFormation date formatting (#28149)

The trailing `Z` is now required: 

- [ExpirationDate](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket-rule.html#cfn-s3-bucket-rule-expirationdate)
- [TransitionDate](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket-transition.html#cfn-s3-bucket-transition-transitiondate)

Closes #28065, #28124.

----

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

Author: msambol

packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.autoscaling.lit.js.snapshot/aws-lambda-autoscaling.assets.json

@@ -132,6 +132,15 @@
       },
       "Schedule": "cron(0 20 * * ? *)",
       "ScheduledActionName": "ScaleDownAtNight"
+     },
+     {
+      "EndTime": "2023-12-26T00:00:00Z",
+      "ScalableTargetAction": {
+       "MaxCapacity": 20
+      },
+      "Schedule": "cron(0 20 * * ? *)",
+      "ScheduledActionName": "WithStartAndEnd",
+      "StartTime": "2023-12-25T00:00:00Z"
      }
     ],
     "ServiceNamespace": "lambda"

packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.autoscaling.lit.js.snapshot/aws-lambda-autoscaling.template.json

@@ -42,6 +42,13 @@ class TestStack extends cdk.Stack {
       maxCapacity: 20,
     });
 
+    scalingTarget.scaleOnSchedule('WithStartAndEnd', {
+      schedule: appscaling.Schedule.cron({ hour: '20', minute: '0' }),
+      startTime: new Date('2023-12-25'),
+      endTime: new Date('2023-12-26'),
+      maxCapacity: 20,
+    });
+
     new cdk.CfnOutput(this, 'FunctionName', {
       value: fn.functionName,
     });

packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.autoscaling.lit.js.snapshot/cdk.out

@@ -6,11 +6,11 @@
     "LifecycleConfiguration": {
      "Rules": [
       {
-       "ExpirationDate": "2019-10-01T00:00:00",
+       "ExpirationDate": "2019-10-01T00:00:00Z",
        "Status": "Enabled"
       },
       {
-       "ExpirationDate": "2019-10-01T00:00:00",
+       "ExpirationDate": "2019-10-01T00:00:00Z",
        "ObjectSizeGreaterThan": 500,
        "ObjectSizeLessThan": 600,
        "Status": "Enabled"