Clears the cached access token for Azure. Call this function after changing the configuration of Azure managed identities.
An Azure object store can support and manage multiple identities. If multiple identities are in use, Vertica looks for an Azure tag with a key of VerticaManagedIdentityClientId, the value of which must be the client_id attribute of the managed identity to be used. If the Azure configuration changes, use this function to clear the cache.
AZURE_TOKEN_CACHE_CLEAR ( )