feat(applicationautoscaling): add support for timezone to scaleOnSchedule function

[robertd]

Added support for timezone to AWS::ApplicationAutoScaling::ScalableTarget ScheduledAction.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-applicationautoscaling-scalabletarget-scheduledaction.html#cfn-applicationautoscaling-scalabletarget-scheduledaction-timezone

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[gitpod-io]

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: c1e9e50
• Result: FAILED
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