feat(autoscaling): step scaling policy supports estimatedInstanceWarm…

…up property (#20936)

Fix #10514

----

### All Submissions:

* [ x] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

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

packages/@aws-cdk/aws-autoscaling/lib/step-scaling-policy.ts

@@ -108,6 +108,7 @@ export class StepScalingPolicy extends Construct {
       this.lowerAction = new StepScalingAction(this, 'LowerPolicy', {
         adjustmentType: props.adjustmentType,
         cooldown: props.cooldown,
+        estimatedInstanceWarmup: props.estimatedInstanceWarmup,
         metricAggregationType: props.metricAggregationType ?? aggregationTypeFromMetric(props.metric),
         minAdjustmentMagnitude: props.minAdjustmentMagnitude,
         autoScalingGroup: props.autoScalingGroup,
@@ -138,6 +139,7 @@ export class StepScalingPolicy extends Construct {
       this.upperAction = new StepScalingAction(this, 'UpperPolicy', {
         adjustmentType: props.adjustmentType,
         cooldown: props.cooldown,
+        estimatedInstanceWarmup: props.estimatedInstanceWarmup,
         metricAggregationType: props.metricAggregationType ?? aggregationTypeFromMetric(props.metric),
         minAdjustmentMagnitude: props.minAdjustmentMagnitude,
         autoScalingGroup: props.autoScalingGroup,

packages/@aws-cdk/aws-autoscaling/test/scaling.test.ts

@@ -205,6 +205,7 @@ describe('scaling', () => {
         namespace: 'Henk',
         dimensionsMap: { Mustache: 'Bushy' },
       }),
+      estimatedInstanceWarmup: cdk.Duration.seconds(150),
       // Adjust the number of legs to be closer to 2
       scalingSteps: [
         { lower: 0, upper: 2, change: +1 },
@@ -241,6 +242,7 @@ describe('scaling', () => {
     Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::ScalingPolicy', {
       MetricAggregationType: 'Average',
       PolicyType: 'StepScaling',
+      EstimatedInstanceWarmup: 150,
       StepAdjustments: [
         {
           MetricIntervalUpperBound: 0,