Support passing management object type to data resource of custom_attribute

[rdbartram]

Description

When trying to use the data resource for custom_attribute, if there are more than one of any name, then only the first is returned and this is obviously not good.

Potential Terraform Configuration

data "vsphere_custom_attribute" "attribute" {
  name                = "terraform-test-attribute"
  managed_object_type = "VirtualMachine"
}

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