chore(examples): migrate from opentelemetry-jaeger to opentelemetry-otlp

I updated the autonatv2 example to fix a [cargo-deny error](https://github.com/libp2p/rust-libp2p/actions/runs/21697462523/job/62600035765) caused by the [deprecation of the opentelemetry-jaeger crate](https://rustsec.org/advisories/RUSTSEC-2025-0123). It has been migrated to opentelemetry-otlp. And I verified that the example works as expected (see the screenshot below).


<img width="1256" height="751" alt="image" src="https://github.com/user-attachments/assets/d3dd4c3c-2d86-4945-8295-9836a885221a" />

Pull-Request: #6270.

Author: ackintosh