Avoid reporting cyclical references in hover/semtok/go-to-*

[radeksimko]

Currently, the reference in the configuration below is treated as valid in the context of hover, semantic token highlighting and go-to-definition/go-to-references, even though it's not a valid reference.

resource "aws_instance" "test" {
  ami = aws_instance.test.ami
}

[radeksimko]

There is some logic handling address resolution which we could share between target and origin collection, but it would need to be refactored (out).

I think ideally, we should end up with 1 or more functions which walk the AST (hcl.Body) & schema, and keep track of the address in any given context - in case of targets we'd just collect the address and append it to the slice, in case of origin we'd compare it with the traversal for equality.