Use config server for OAV config files

[jacob720]

Fixes DiamondLightSource/mx-bluesky#1448
DNM - requires future features of daq-config-server

Instructions to reviewer on how to test:

1. Check OAV config is read through config server

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}