Fix(eos_validate_state): ANTA Fix logs in tests to be more accurate

[carl-baillargeon]

Some tests have a single try except block when assigning the required variables, leading to a less accurate log message if one of the variable is missing.

The try except block will also catch the first missing variable but not the others:

        for ethernet_interface in ethernet_interfaces:
            try:
                for var in required_vars:
                    get(ethernet_interface, var, required=True)

                peer_ethernet_interfaces = get(self.hostvars, f"{ethernet_interface['peer']}.ethernet_interfaces", required=True)
                peer_interface = get_item(
                    peer_ethernet_interfaces,
                    "name",
                    ethernet_interface["peer_interface"],
                    required=True,
                    var_name=f"name: {ethernet_interface['peer_interface']}",
                )
                peer_interface_ip = get(peer_interface, "ip_address", required=True)
                [...]
            except AristaAvdMissingVariableError as e:
                LOGGER.info("Variable '%s' is missing. Please validate the Ethernet interfaces data model of this host and his peer(s).", str(e))
                continue

The tests should be refactor to have accurate logs with the missing variables for the test.

[carl-baillargeon]

Fixed in #3352