Moving InnerEye's Azure code to hi-ml package

[ant0nsc]

Closes Issue 62 on the hi-ml repository.

[dumbledad]

I have a problem with tests timing out. For example look at the last run of our InnerEye PR build on ADO for this PR: https://innereye.visualstudio.com/InnerEye/_build/results?buildId=43337&view=results The error is

##[error]The operation was canceled
##[error]The job running on agent Azure Pipelines 4 ran longer than the maximum time of 60 minutes. For more information, see https://go.microsoft.com/fwlink/?linkid=2077134

In the past we have seen timeout errors when the test environment fails to get the AML credentials (e.g. for the Service Principal) but that is not the case here, since the logs with the timeout (here) show the successful elevation before the timeout occurs.

Further evidence that this is not a problem restricted to this PR can be seen in this run: https://innereye.visualstudio.com/InnerEye/_build/results?buildId=43339&view=results The same tests are timing out if I run the our InnerEye build pipeline in ADO on our main branch!

@javier-alvarez & @mebristo, any ideas?

===== EDIT =====

The test Shruthi pinpointed (and removed) fixed the hanging runs AML bug for us.