ddtrace/tracer: add integration tag to spans_started/finished #3647

Job	Run time
Prepare Go modules cache	8s
Smoke Tests	0s
linux/amd64 golang:1.23-bookworm	1m 26s
macos-latest (AppSec disabled)	1m 58s
linux/arm64 golang:1.23-bookworm	3m 2s
windows-latest (AppSec disabled)	5m 38s
linux/amd64 golang:1.23-bullseye	1m 31s
ubuntu-latest-16-cores (AppSec disabled)	1m 26s
linux/arm64 golang:1.23-bullseye	3m 9s
linux/amd64 golang:1.23-alpine	1m 23s
linux/arm64 golang:1.23-alpine	3m 1s
macos-13 go1.23	4m 53s
linux/amd64 golang:1.22-bookworm	1m 27s
macos-13 go1.22	5m 17s
linux/arm64 golang:1.22-bookworm	3m 6s
macos-15 go1.23	3m 5s
linux/amd64 golang:1.22-bullseye	1m 25s
macos-15 go1.22	3m 35s
linux/arm64 golang:1.22-bullseye	3m 14s
linux/amd64 golang:1.22-alpine	1m 15s
linux/arm64 golang:1.22-alpine	3m 5s
	53m 4s

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