Use get_run_status instead of get_run to retrieve status

[freetonik]

IQM Client 3.2 introduced a new function get_run_status which returns the status of a job, but, unlike get_run, returns status only, and never returns measurement results.

Previously, qiskit-on-iqm's IQMJob.status() function would return the status, but if the status was ready, it would also save the measurement results in memory behind the scenes. As a result, the consequent IQMJob.result() function would return the results instantaneously, without calling the client.

With the current change, IQMJob.status() uses the new function of IQM Client, and thus does not save results behind the scenes when user requests the status.