Transports need to handle exceptions from validation errors when calling Attribute.put

[GDYendell]

Currently for EPICS CA we just get

In [1]: mef65357@pc0118.cs.diamond.ac.uk GARYEIGER:ArmTimeout.VAL 3 -> 0
[2026-03-05 13:13:39.735+0000 I] PV put: GARYEIGER:ArmTimeout = 0                                                 [fastcs.transports.epics.ca.ioc] pv=GARYEIGER:ArmTimeout, value=0
[2026-03-05 13:13:39.735+0000 E] Exception when running dispatched callback

when this exception is raised.

Acceptance Criteria

• Nice errors are logged when puts are rejected