appsec: stop storing span tags, directly call span.SetTag #3537

Job	Run time
Prepare Go modules cache	43s
Smoke Tests	0s
macos-13 go1.23	7m 15s
macos-latest (AppSec disabled)	2m 22s
macos-13 go1.22	6m 10s
macos-15 go1.23	3m 40s
windows-latest (AppSec disabled)	4m 27s
macos-15 go1.22	4m 11s
ubuntu-latest-16-cores (AppSec disabled)	1m 25s
linux/amd64 golang:1.23-bookworm	1m 30s
linux/arm64 golang:1.23-bookworm	3m 22s
linux/amd64 golang:1.23-bullseye	1m 26s
linux/arm64 golang:1.23-bullseye	3m 5s
linux/amd64 golang:1.23-alpine	1m 20s
linux/arm64 golang:1.23-alpine	3m 13s
linux/amd64 golang:1.22-bookworm	1m 39s
linux/arm64 golang:1.22-bookworm	3m 23s
linux/amd64 golang:1.22-bullseye	1m 23s
linux/arm64 golang:1.22-bullseye	3m 11s
linux/amd64 golang:1.22-alpine	1m 18s
linux/arm64 golang:1.22-alpine	3m 16s
	58m 19s

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