Create seperate services, iocs maps

[marcelldls]

Changes the expected format of the values.yaml so that the labeling of ec-service can be done in the background and clear separation between services that may have enabling/disabling implemented

services:
  epics-pvcs:
  epics-opis:

iocs:
  b01-1-ea-test-01:
    targetRevision: 2024.9.1

Additional optimisation:

• Replace $currentScope for just $

[gilesknap]

It occurs to me that non-iocs may choose to support the enabled flag.
Do we want to allow them to be controlled by ec? I don't see why not.

If we decide yes, then maybe the iocs map needs a different name?
@DiamondJoseph @coretl do you have an opinion on thsi?