Add some autospecs in the patches

[DominicOram]

We have previously seen issues with tests passing but not catching errors as the function that we're patching out has changed arguments, we should add autospec to some more patches so that we would catch these kinds of issues.

Acceptance Criteria

• autospec=True is added to patched functions
• There are docs around this

[DominicOram]

Docs at https://github.com/DiamondLightSource/python-artemis/wiki/Unit-Testing-Tips-and-Tricks#patching-in-unit-tests