Update start notebook to use get_engine instead of get_qcs_objects_for_notebook

[senecameeks]

Addresses #6427 by removing the incorrect processor_id in the notebook.

Although this doesn't fix the underlying issue as to why get_qcs_objects_for_notebook is incorrect and doesn't address Will's second point in his comment

FYI, I verified this works as a good replacement for get_qcs_objects_for_notebook

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[eliottrosenberg]

LGTM, thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.76%. Comparing base (d75d43f) to head (02d998b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6483   +/-   ##
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  Coverage   97.76%   97.76%           
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  Files        1105     1105           
  Lines       94936    94963   +27     
=======================================
+ Hits        92810    92837   +27     
  Misses       2126     2126           

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[NoureldinYosri]

this might not work if it's run from outside corp network in which case authentication is needed which is part of get_qcs_objects_for_notebook

Cirq/cirq-google/cirq_google/engine/qcs_notebook.py

Line 104 in eef7c5c

a = auth.authenticate_user(clear_output=False)

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to check if it will from outside corp network try to run then notebook in colab.research

[senecameeks]

Thanks @NoureldinYosri for the catch!

#6485 exposes authenticate_user, which I've added to this start notebook.
In the case where get_engine throws an exception, it will default to a virtual engine instance using get_qcs_notebook_objects. Note that because virtual is set to True, it does not print the erroneous message Using processor: which was the impetus for this change (See #6427).

[wcourtney]

LGTM, thanks!