[chore] Update collector demo

[TylerHelmuth]

Description:
#26546 removed the jaeger exporter, but the build-and-test workflow depended on that exporter since it uses the config in examples/demo/otel-collector-config.yaml for its test.

This PR updates the demo to use OTLP with jaeger, which also fixes the rpm and deb test job in build-and-test.

[codeboten]

You'll want to update

opentelemetry-collector-contrib/examples/demo/docker-compose.yaml

Line 9 in 9b47107

- "16686:16686"

to start the collector w/ other ports exposed... likely 4317 will cause collisions though

[TylerHelmuth]

@codeboten testing locally things are working - I believe jaeger is doing some magic for us. Traces are making it to jaeger at 4137 despite the port not being exposed

[codeboten]

@TylerHelmuth huh... i stand corrected! Thanks for validating