[cmd/telemetrygen] add support for profiles

[haoqixu]

Component(s)

cmd/telemetrygen

Describe the issue you're reporting

Add support for profiles to telemetrygen to support profiles in e2e tests.

related: #35999

[github-actions]

Pinging code owners:

• cmd/telemetrygen: @mx-psi @codeboten

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[mx-psi]

@dmathieu is there any way we can do this today?

[dmathieu]

With rather simple data to reduce the amount breaking changes?

[mx-psi]

Ideally, yes :)

[dmathieu]

Actually, as I'm looking at this, it appears to be tricky to do.
There is no OTLP exporter for profiles, because the only location that does this export is the eBPF agent (the otel-go SDK doesn't handle profiles, and isn't meant to).