deps: bump prometheus/client_golang to v1.25.0 (#5599)

Move client_golang to v1.25.0 with its required module updates
(client_model v0.6.3, common v0.72.0, procfs v0.22.0, xxhash v2.3.0,
protobuf v1.36.12, munnerz/goautoneg). go.mod keeps go 1.26.0 and has
no toolchain line.

Sync the frpc text metrics clone with the new default Go collector:
add go_gc_gogc_percent, go_gc_gomemlimit_bytes and
go_sched_gomaxprocs_threads, update the go_memstats help texts, and
remove go_memstats_lookups_total. frpc still exposes go_* metrics only.

pkg/metrics/text/text_test.go

@@ -24,6 +24,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
 )
 
@@ -41,7 +42,7 @@ func gather(t *testing.T) string {
 // so anything a scraper would reject fails the test.
 func parseFamilies(t *testing.T, body string) map[string]*dto.MetricFamily {
 	t.Helper()
-	parser := expfmt.TextParser{}
+	parser := expfmt.NewTextParser(model.UTF8Validation)
 	families, err := parser.TextToMetricFamilies(strings.NewReader(body))
 	require.NoError(t, err, "output must be valid text exposition format")
 	return families