ddtrace/tracer: add integration tag to spans_started/finished #3881

Job	Run time
Prepare Go modules cache	7s
Smoke Tests	0s
macos-13 go1.23	5m 38s
macos-latest (AppSec disabled)	1m 56s
macos-13 go1.22	7m 46s
windows-latest (AppSec disabled)	3m 42s
macos-15 go1.23	5m 15s
linux/amd64 golang:1.23-bookworm	1m 28s
ubuntu-latest-16-cores (AppSec disabled)	1m 18s
macos-15 go1.22	4m 46s
linux/arm64 golang:1.23-bookworm	3m 28s
linux/amd64 golang:1.23-bullseye	1m 30s
linux/arm64 golang:1.23-bullseye	3m 19s
linux/amd64 golang:1.23-alpine	1m 25s
linux/arm64 golang:1.23-alpine	3m 28s
linux/amd64 golang:1.22-bookworm	1m 19s
linux/arm64 golang:1.22-bookworm	3m 1s
linux/amd64 golang:1.22-bullseye	1m 31s
linux/arm64 golang:1.22-bullseye	3m 24s
linux/amd64 golang:1.22-alpine	1m 24s
linux/arm64 golang:1.22-alpine	3m 19s
	59m 4s

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