Process metrics should not be reported (at least by default) by the instrumentation libraries

[lmolkova]

Description

See open-telemetry/semantic-conventions#1215

Individual runtimes are expected to report their own CPU and memory metrics even if process.* ones are suitable.
There is no clear conclusion on whether runtimes are not allowed to report them vs they should be opt-in.

Expected behavior

Golang may define golang-specific CPU/memory metrics and should not report process ones (by default)