pyroscope.scrape: Standarize profile names

[simonswine]

When a user adopts godeltaprof_, currently the resulting profile typename is shown separately from the default ones. That makes is harder than it should be to adopt godeltaprof.

I am proposing that we send the profiles still under the name without the godeltaprof prefix.

@korniltsev do you think this might break anything down the line? I don't think so

@aknuds1 reported that initially