Update long range entanglement tutorial

[miamico]

This notebook brings substantial updates to the long-range entanglement tutorial to support the novel capabilities. In particular:

• removed post-processing technique and text
• removed randomized certification of fidelity and corresponding text
• limit number of qubits measured to amount currently supported (16)
• use hellinger fidelity of the bell pair created by the CNOT between the terminal qubits of the chain as measure of performance

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[qiskit-bot]

Thanks for contributing to Qiskit documentation!

Before your PR can be merged, it will first need to pass continuous integration tests and be reviewed. Sometimes the review process can be slow, so please be patient. Thanks! 🙌

One or more of the following people are relevant to this code:

• @miamico

[abbycross]

Thanks!

[miamico]

@abbycross should we merge this one?

[jyu00]

I guess I'm a bit too late, but this should also be updated with the same comment I left for #3479 w.r.t early access - i.e. don't use dynamic_circuits=True (because it'll always return an empty list), and explicitly call out that adding IfElseOp & gen3-experimental is only necessary during early access.

[Eric-Arellano]

I guess I'm a bit too late

It's not yet synced to closed-source, so can be fixed in a follow up :)