PEARL: remove DISP setting code from

[rerpha]

From CR of PEARL: the runstate setting is causing some issues with running experiments, so instead of being locked out unless in SETUP we would like to just defer the responsibility of this to our own scripts (basically to add some confirmation prompt to say "are you sure you want to set this script while running")

Acceptance criteria

• DISP setting code is removed from PEARLPC

We might as well keep the underlying code in utilities as it may be helpful in the future.

To test this, pull changes, start server and add pearlpc as devsim, then try and set a pressure while your simulated DAE is RUNNING. if this works this change is successful

[rerpha]

ISISComputingGroup/EPICS-ioc#831
ISISComputingGroup/EPICS_PearlPressure#13
release notes are a bit weird as im just reverting adding it in the first place #8245