Change or manage existing schedule timing using Powershell runbook

### Description

Hello Team ,

Kindly provide a way to change a existing update management schedule using PowerShell runbook in an automation account.

This is a requirement for our enterprise applications.

Let us know a way to provide an implementation for the same.

Thank you.

Regards ,
Libin

### Script or Debug output

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### Environment data

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### Module versions

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### Error output

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Start with the Azure PowerShell commands and documentation for Update Management schedules and Automation Accounts. Determine the supported way to change an existing schedule from a PowerShell runbook, and define completion as a documented implementation path or a scoped feature with validation for enterprise applications.

Written by the indexing model from the issue text.