AGIC strips "globalConfiguration" setting from the App Gateway when generating configuration

[MattHodge]

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Describe the bug The AGIC will strip off the globalConfiguration settings of the Application Gateway when generates a configuration and applies it to the application gateway.

To Reproduce

• Create an Application Gateway with globalConfiguration options configured. Example .bicep file here.
• Confirm that the globalConfiguration options are present:

az network application-gateway show --name <name> -g <resourceGroup> | jq .globalConfiguration

• Associate the Application Gateway with the AKS Cluster
• Wait for AGIC to generate a configuration for the Application Gateway, and you will see the json output does not include the globalConfiguration object
• Confirm that the globalConfiguration options are now set to null:

az network application-gateway show --name <name> -g <resourceGroup> | jq .globalConfiguration

Ingress Controller details Image: mcr.microsoft.com/azure-application-gateway/kubernetes-ingress:1.4.0 Image ID: sha256:5ad5239382f01438687342946dceea96b45d38a9ec396f73e5533bf5b0a8d432