[chore] remove method using a deprecated struct

collector/testutil/testutil.go

@@ -7,14 +7,11 @@ import (
 	"net"
 	"os/exec"
 	"runtime"
-	"strconv"
 	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-
-	"go.opentelemetry.io/collector/service/telemetry"
 )
 
 type portpair struct {
@@ -57,22 +54,6 @@ func GetAvailableLocalAddress(t testing.TB) string {
 	return endpoint
 }
 
-func GetAvailableLocalAddressPrometheus(t testing.TB) *telemetry.Prometheus {
-	address := GetAvailableLocalAddress(t)
-	host, port, err := net.SplitHostPort(address)
-	if err != nil {
-		return nil
-	}
-	portInt, err := strconv.Atoi(port)
-	if err != nil {
-		return nil
-	}
-	return &telemetry.Prometheus{
-		Host: &host,
-		Port: &portInt,
-	}
-}
-
 func findAvailableAddress(t testing.TB) string {
 	ln, err := net.Listen("tcp", "localhost:0")
 	require.NoError(t, err, "Failed to get a free local port")