Qiskit / qiskit-ibm-runtime / 33383231548

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Correctly retrieve jobs from retired backends (#3020)

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### Summary

Revise the handling of jobs from retired backends (by having an inner
function raise when their configuration could not be accessed), so the
`job()` and `jobs()` methods produce an `IBMRetiredBackend` in that
case.

### Details and comments

Fixes #3012

### 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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