Qiskit / qiskit-ibm-runtime / 30036119972

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Improve the lazy import of `aer_executor` via `HAS_AER` (#3078)

### Summary
A small improvement to how `qiskit_ibm_runtime.aer_executor` handles the
lazy import of `qiskit-aer`. Namely, we can leverage
`HAS_AER.require_in_call`/`HAS_AER.require_in_instance` to only check
for the import of `qiskit-aer` as needed. We also update other unit
tests that make use of `qiskit-aer` to be skippable if not installed.

### Details and comments


### 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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