ddtrace/tracer: initialize runtimeMetricsV2 with statsd "direct" client #3468

Job	Run time
Prepare Go modules cache	4s
Smoke Tests	0s
macos-latest (AppSec disabled)	2m 50s
windows-latest (AppSec disabled)	2m 59s
ubuntu-latest-16-cores (AppSec disabled)	1m 8s
linux/amd64 golang:1.23-bookworm	1m 37s
linux/arm64 golang:1.23-bookworm	3m 2s
macos-13 go1.23	5m 5s
linux/amd64 golang:1.23-bullseye	1m 23s
macos-13 go1.22	8m 36s
linux/arm64 golang:1.23-bullseye	3m 14s
linux/amd64 golang:1.23-alpine	1m 17s
macos-15 go1.23	4m 20s
linux/arm64 golang:1.23-alpine	2m 56s
macos-15 go1.22	3m 49s
linux/amd64 golang:1.22-bookworm	1m 19s
linux/arm64 golang:1.22-bookworm	2m 58s
linux/amd64 golang:1.22-bullseye	1m 26s
linux/arm64 golang:1.22-bullseye	3m 15s
linux/amd64 golang:1.22-alpine	1m 15s
linux/arm64 golang:1.22-alpine	3m 7s
	55m 40s

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