Qiskit / qiskit-ibm-runtime / 28459800779

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Add tests and improve docs for `box_circuit` (#2967)

### Summary
The function (central, used by multiple `prepare` functions) is
currently untested.

This PR adds tests and improves the documentation, clarifying how it
uses the samplomatic passmanager behind the scenes. In addition, it
consolidates how it's used by the various `prepare` functions and by
`get_layers`, ensuring that all of these functions consume the options
in the same way.

Fixes #2966 

### 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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Co-authored-by: TsafrirA <113579969+TsafrirA@users.noreply.github.com>

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