Qiskit / qiskit-ibm-runtime / 7012654929

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Make sessions thread safe (#1196)

* Make sessions thread safe.

The lock prevents other threads from sending new jobs to the service
only if the session hasnot been setup yet. I.e.: when sending the
first "session starter job", or root job. After this happens, the code
is left unlocked to allow threads to access the service concurrently.

Error handling is needed to ensure the lock is always released.

* Allow multiple sessions to execute simultaneously

* Make session test more deterministic

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Co-authored-by: Kevin Tian <kevin.tian@ibm.com>
Co-authored-by: Jessie Yu <jessieyu@us.ibm.com>

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