Add is_running_in_serverless()
function
#1532
Merged
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Summary
This adds a function so that the user can easily detect whether the program is running under Qiskit serverless. In some instances, a person may want to be able to branch on whether that is the case.
Details and comments
I am not necessarily attached to this name.
For the tests, I improved them by making the environment variable handling be temporary and in a fixture. This meant a slight migration to pytest style (from unittest style), and silencing a pylint warning.