Create PV showing whether ISIS is in cycle [TIMEBOX: 2.5 days]

As part of the discussion for https://github.com/ISISComputingGroup/IBEX/issues/7626, we decided that it would be useful to have a facility PV that displays whether ISIS is currently in cycle. In the first instance, this would be useful for triggering automated utility scripts used to maintain the shared instrument scripts repo which we want to run once after every cycle, as discussed in the ticket linked above.

### Acceptance Criteria
- [ ] We have a single facility wide PV showing the current In Cycle status of the ISIS Facility

### Extra Information
- Depends on: https://github.com/ISISComputingGroup/IBEX/issues/7915
- ~This PV should likely come from Accelerator Controls, This ticket might just be sending an email asking them to create this PV~ See Freddie's comment

## How to Test
_verbose instructions for reviewer to test changes
(**Add before making a PR**)_