Bug fixes for e2e tests

[rigidit]

There is e2e test failing with ValueError: Probabilities do not add up to 1: defaultdict(<class 'int'>, {'0': 0.4991999864578247, '1': 0.4991999864578247}) that tests qiskit submission to ionq. To fix the test, we switch to 1e-2 in qiskit job's draw_random_sample to allow probability sums in the range [0.99, 1.01] to be normalized rather than raising an error.

Another e2e test failed when testing cirq.Circuit program run against quantinuum target, which caused by exception swallowed in first job.results call inside run method, and the fallback path then calls job.results on the same CirqJob again this time successfully and internally already returns a fully-converted cirq.ResultDict, but ater that there is target_obj._to_cirq_result call for the result and it fails wih AttributeError: 'ResultDict' object has no attribute 'items'. To fix this one we surface error for the CirqJob path immediately instead of silently falling into the wrong code path.

[pavelbraginskiy]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pavelbraginskiy]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).