Dodal connect on i22 is not actually connecting

[DominicOram]

If I run dodal connect i22 I get all of the beamline connected suspiciously quickly. It turns out that if I edit one of the PV prefixes in i22.pyto be incorrect then dodal connect i22 will still pass.

Acceptance Criteria

• If I deliberately break one of the PV prefixes in i22.py then dodal connect i22 actually fails

[DominicOram]

@callumforrester and @DiamondJoseph am I right that this is different to #850?

[DiamondJoseph]

This is different than 850: 850 is that when make_all_devices is called, any exceptions in the device_instantiation way of creating and connected devices are swallowed and do not cause test failures.
This is that make_all_devices doesn't ever call connect on the devices given from a @device_factory after they are made- make_all_devices may catch exceptions in instantiating the device and prevent it being an error, but not in the connect which is what's more useful...

[callumforrester]

Additional acceptance criteria: If we could have a regression unit test that would be great