Description
Fix: #21793

There are two problems with this issue:

1. --edge-zone parameter is not converted through validate_edge_zone, resulting in the following InvalidTemplate error reports:

{"error":{"code":"InvalidTemplate","message":"Deployment template parse failed: 'Error converting value "microsoftrrdclab1" to type 'Azure.Deployments.Core.Definitions.Resources.ResourceExtendedLocation'. Path ''.'."}}

This PR is used to fix this problem

2. After fixing the first problem, an error will still occur because creating Flex VMSS still does not support edge zone

{"code":"BadRequest","message":"{ "error": { "code": "InvalidParameter", "message": "Parameter 'extendedLocation' is not allowed.", "target": "extendedLocation" }}}

We have confirmed with the Flex VMSS team @fitzgeraldsteele to keep this behavior and error message first, and wait for the subsequent support from service in Cu semester comment link

Testing Guide

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change
[Component Name 2] az command b: Add some customer-facing feature

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