Fix: #18042: Updated Get-AzWebApp and Get-AzWebAppSlot to expose VirtualNetworkSubnetId property

[Kotasudhakarreddy]

#18042

Description

Currently, Get-AzWebApp (for one given App Service or Function App to get all details, instead of list), does not include VNet integration info. There is an attribute VirtualNetworkSubnetId, but it's null.

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[wyunchi-ms]

/azp run azure-powershell - security-tools

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