Qiskit / qiskit-ibm-runtime / 28241693970

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Executor passthrough data does not passthrough arrays (#2964)

### Summary
This PR fixes a bug where `np.array`s inside passthrough data are
incorrectly converted into `list`s upon serialization.
The full issue is reported in issue #2954 

### AI/LLM disclosure

- [x] I didn't use LLM tooling, or only used it privately.
- [ ] I used the following tool to help write this PR description:
- [ ] I used the following tool to generate or modify code:

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