fix: Handle Speedscope sample types in ingestion

[jake-kramer]

Fixes #3989

[jake-kramer]

The dots were messing with downstream sample type parsing:

pyroscope/pkg/ingester/pyroscope/ingest_adapter.go

Lines 202 to 209 in 8db0333

	app = pi.LabelSet.ServiceName()
	parts := strings.Split(app, ".")
	if len(parts) <= 1 {
	stType = stTypeCPU
	} else {
	stType = parts[len(parts)-1]
	app = strings.Join(parts[:len(parts)-1], ".")
	}

[marcsanmi]

LGTM 👍