Hypershift Operator Keyvault for Azure Etcd Encryption is Hardcoded to Public Cloud

The hypershift operator introduced Azure customer-managed keys etcd encryption in https://github.com/openshift/hypershift/pull/3183.  The implementation will not work in any non-Azure Public Cloud as the keyvault URL is hardcoded: https://github.com/openshift/hypershift/blob/cd4d4c69a64d8983da04d7bb26ea39a72109e135/control-plane-operator/controllers/hostedcontrolplane/hostedcontrolplane_controller.go#L4871 to vault.azure.net, which is only the public cloud keyvault domain suffix.  The cloud-specific keyvault domain suffixes are here: https://learn.microsoft.com/en-us/azure/key-vault/general/about-keys-secrets-certificates#dns-suffixes-for-object-identifiers
    

    Since https://github.com/openshift/hypershift/pull/3183 was merged

    Every time

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    The keyvault domain is hardcoded to work specifically for public cloud, but will not for azure gov cloud when using etcd encryption with customer-managed keys

    The keyvault domain to fetch from will use the correct cloud's domain suffix as outlined here: https://learn.microsoft.com/en-us/azure/key-vault/general/about-keys-secrets-certificates#dns-suffixes-for-object-identifiers