Galil: Redefines positions if sent move on IOC start up

As an instrument scientist I would like an IOC start up to not affect motion in any way. On LARMOR it was seen that when a move was sent to the IOC on start up due to https://github.com/ISISComputingGroup/IBEX/issues/6423 the IOC redefined the position on the motor to somewhere it was not (~10:15 in the attached log and graph). This was likely a combination of the Galil always redefining positions on start up (normally not an issue as it defines to it's current position) and the move being sent at just the wrong time.

[GALIL_05-20210421.log](https://github.com/ISISComputingGroup/IBEX/files/6357659/GALIL_05-20210421.log)


## Acceptance Criteria
* The IOC does not redefine to the wrong position on start up. If we can't fix the race condition then just remove the redefining of position at all
* There is a test for this

Inizia con il file GALIL_05-20210421.log allegato e il movimento di avvio descritto nell’issue 6423, concentrandoti sul momento intorno alle 10:15. Riproduci lo scenario di avvio dell’IOC e verifica che la posizione del motore non venga ridefinita in modo errato; aggiungi un test che copra questo caso di avvio.

Scritto dal modello di indicizzazione a partire dal testo della issue.