fix(azure): Consumption legacy usage details

[disq]

Fixes https://github.com/cloudquery/cloudquery-issues/issues/565

This fix ignores all returned types except LegacyUsageDetail from the API call (which can sometimes include ModernUsageDetail for some undocumented reason, to our understanding) but since we have another resource listing those (azure_consumption_billing_account_modern_usage_details) we don't want them here.

// UsageDetailClassification provides polymorphic access to related types.
// Call the interface's GetUsageDetail() method to access the common type.
// Use a type switch to determine the concrete type.  The possible types are:
// - *LegacyUsageDetail, *ModernUsageDetail, *UsageDetail
type UsageDetailClassification interface {
	// GetUsageDetail returns the UsageDetail content of the underlying type.
	GetUsageDetail() *UsageDetail
}