Rethink architecture

I think that rather than ssh'ing into an instrument to check its git status, we should host a REST API which presents it without auth.

This would make the jenkins job a bit more secure and simpler.

Consider using something like https://fastapi.tiangolo.com/ which runs the commands in https://github.com/ISISComputingGroup/HotfixStatusChecker/blob/master/utils/hotfix_utils/InstrumentChecker.py on the server-side, which runs a service (under procserv?) and responds to a call like

GET GITSTATUS - > output of `git status --porcelain`

Start with utils/hotfix_utils/InstrumentChecker.py and the FastAPI documentation, then review how the Jenkins job currently checks instrument git status over SSH. Clarify the service boundary and procserv deployment before implementation; done should mean Jenkins can obtain output equivalent to git status --porcelain through the proposed REST endpoint.

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