multiple tutorials broken when using real hardware

[natestemen]

Many of the tutorials are run on simulators, but have a variable that allow the reader to change the execution path to a quantum device. E.g. variable USE_REAL_HARDWARE in https://mitiq.readthedocs.io/en/stable/examples/ibmq-backends.html
This path is not tested by our documentation and is likely broken for multiple examples since IBM has started deprecating some functionality.

First thing we need to do is figure out which examples are broken so we can fix them.