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Reintroduce support for multiple result decoders (#2899)

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### Summary

Revise the methods that accept `result_decoder` to ensure they also
support sequences of decoders (ie. `type[ResultDecoder] |
Sequence[type[ResultDecoder]] | None = None`) consistently, and update
the logic so the decoders are called in chain in that case.

In practice, it re-introduces the ability of using multiple decoders,
with provides for some degree of easy customizability by end users. It
was introduced around #1450 for dealing with the websocket mechanism,
and some remains remained at the interface level although in practice
[it was restricted to one
decoder](https://github.com/Qiskit/qiskit-ibm-runtime/blob/0.47.0/qiskit_ibm_runtime/base_runtime_job.py#L110-L113)
out of two.

Additionally, it avoids passing the decoder explicitly from the
Primitive classes, as `DEFAULT_DECODERS` is used under the hood for
selecting a default (making declaring and passing them from Primitives
unneeded, and saving some import pressure).

### Details and comments

Related #2852 - not marking as fixed as this does not revise existing
decoders.

### AI/LLM disclosure

- [x] I didn't use LLM tooling, or only used it privately.

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Source Files on job unit-tests_python3.12-windows-latest - 27264001633.4