software/grafana: build with new module support in component/golang
We still need to checkout from git these packages, because most of them use `replace` in their go.mod, which is only compatible with installing as main module, but not as an external module. promtail will use go-systemd when cgo is enabled, but we don't want to ship a full systemd in slapos, so we build with CGO_ENABLED=0 grafana on the other hand needs to be build with CGO_ENABLED, because it will use sqlite3. grafana also needs to use yarn to build the frontend, so it remain a dedicated section with ad-hoc installation method.
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