runtime: remove datadog-agent from prof labels hall of shame
github.com/DataDog/datadog-agent has stopped using runtime_setProfLabel
and runtime_getProfLabel, remove them from the hall of shame.
Updates #67401
Change-Id: I4a66c5e70397d43d7f064aeae5bad064e168316f
Reviewed-on: https://go-review.googlesource.com/c/go/+/634476
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com>