`INSTETC`: move run metadata PVs to it

( follows on from https://github.com/ISISComputingGroup/DataStreaming/issues/62 )

I would like it to be easier to add new software to control data acquisition hardware in the future.

As such we should move some PVs from the ISISICP/ISISDAE to `INSTETC` such as:
`RBNUMBER`
`TITLE`
`_USERNAME`

(any others?)

these probably all want to be autosaved.

this will need to be done for HRPD-X.

Start with issue #62 and inspect how the listed PVs are currently defined in ISISICP/ISISDAE versus INSTETC for HRPD-X. Confirm which run metadata PVs belong in INSTETC, determine the autosave requirements, and verify that data acquisition still receives the expected metadata after the move.

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