Have the noop transpiler passes promise a convention

[ihincks]

Description

The noop transpiler passes can choose to put non-box instructions on idling qubits either before or after the box that they extend. Right now, this behaviour is not deterministic, it depends on things like instruction ordering.

Acceptance criteria

• The behaviour is deterministic
• The behaviour is selectable (either put all gates before box, or all gates after box)