[AppService] az appservice ase/plan ASEv3 support

[madsd]

Description
This PR adds support for ASE v3 in preview. From a command perspective, a "kind" parameters is added to az appservice ase create. Default is ASEv2 to avoid breaking changes, but you can specify ASEv3 explicitly to create this.
Includes changes to az appservice plan create/update to support the IsolatedV2 SKUs that are associated with ASEv3 and some minor changes to fix #16026 and fix #16118
Adds command az appservice ase create-inbound-services to support creating the inbound services needed for ASEv3 during the preview period. This is expected to be deprecated after GA. Inbound services include

• Ensure subnet private endpoint network policy is disabled
• Create private endpoint
• Create private DNS zone (.appserviceenvironment.net)
• Link zone to virtual network
• Create A records for *, @ and *.scm in zone

Finally the PR aims to align the affected commands with the new Error Handling guidelines

Testing Guide
Assuming a resource group with a virtual network and two empty subnet of at least size /24

az appservice ase create -n <ase-name> -g <resource-group> --subnet <outbound-subnet-name> --vnet-name <vnet-name> --kind ASEv3

az appservice ase create-inbound-services -n <ase-name> -g <resource-group> --subnet <inbound-subnet-name> --vnet-name <vnet-name>

History Notes

[AppService] az appservice ase/plan ASEv3 support
[AppService] Fix #16026 and #16118 for az appservice plan

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[yonzhan]

AppService