Qiskit / qiskit-ibm-runtime / 33098890496

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`ExperimentalSimulatorOptions.layer_noise_model` fallback to `ResilienceOptions.layer_noise_model` (#3280)

### Summary
Adding a fallback mode for the
`ExperimentalSimulatorOptions.layer_noise_model` to instead use
`ResilienceOptions.layer_noise_model` if it hasn't yet been populated

### Details and comments

Closes #3255

### 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:

5 of 5 new or added lines in 2 files covered. (100.0%)

9247 of 10291 relevant lines covered (89.86%)

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