[chore] [receiver/k8scluster] Remove dead code (#24535)

As a result of the effort to move metrics in the k8s cluster receiver to
use the pdata format instead of OpenCensus, some helper methods are now
unused. This change removes unused code.

receiver/k8sclusterreceiver/internal/testutils/metrics.go

@@ -6,27 +6,10 @@ package testutils // import "github.com/open-telemetry/opentelemetry-collector-c
 import (
 	"testing"
 
-	metricspb "github.com/census-instrumentation/opencensus-proto/gen-go/metrics/v1"
-	resourcepb "github.com/census-instrumentation/opencensus-proto/gen-go/resource/v1"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 )
 
-func AssertResource(t *testing.T, actualResource *resourcepb.Resource,
-	expectedType string, expectedLabels map[string]string) {
-	require.Equal(t,
-		expectedType,
-		actualResource.Type,
-		"mismatching resource types",
-	)
-
-	require.Equal(t,
-		expectedLabels,
-		actualResource.Labels,
-		"mismatching resource labels",
-	)
-}
-
 func AssertMetricInt(t testing.TB, m pmetric.Metric, expectedMetric string, expectedType pmetric.MetricType, expectedValue any) {
 	dps := assertMetric(t, m, expectedMetric, expectedType)
 	require.EqualValues(t, expectedValue, dps.At(0).IntValue(), "mismatching metric values")
@@ -54,75 +37,3 @@ func assertMetric(t testing.TB, m pmetric.Metric, expectedMetric string, expecte
 	require.Equal(t, 1, dps.Len())
 	return dps
 }
-
-func AssertMetricsWithLabels(t *testing.T, actualMetric *metricspb.Metric,
-	expectedMetric string, expectedType metricspb.MetricDescriptor_Type,
-	expectedLabels map[string]string, expectedValue int64) {
-
-	require.Equal(t,
-		len(expectedLabels),
-		len(actualMetric.MetricDescriptor.LabelKeys),
-		"mismatching number of labels",
-	)
-
-	require.Equal(t,
-		expectedLabels,
-		getLabelsMap(actualMetric),
-		"mismatching labels",
-	)
-
-	AssertMetricsInt(t, actualMetric, expectedMetric, expectedType, expectedValue)
-}
-
-func AssertMetricsInt(t *testing.T, actualMetric *metricspb.Metric, expectedMetric string,
-	expectedType metricspb.MetricDescriptor_Type, expectedValue int64) {
-	assertMetricsBase(t, actualMetric, expectedMetric, expectedType)
-
-	require.Equal(t,
-		expectedValue,
-		actualMetric.Timeseries[0].Points[0].GetInt64Value(),
-		"mismatching metric values",
-	)
-}
-
-func AssertMetricsDouble(t *testing.T, actualMetric *metricspb.Metric, expectedMetric string,
-	expectedType metricspb.MetricDescriptor_Type, expectedValue float64) {
-	assertMetricsBase(t, actualMetric, expectedMetric, expectedType)
-
-	require.Equal(t,
-		expectedValue,
-		actualMetric.Timeseries[0].Points[0].GetDoubleValue(),
-		"mismatching metric values",
-	)
-}
-
-func assertMetricsBase(t *testing.T, actualMetric *metricspb.Metric, expectedMetric string,
-	expectedType metricspb.MetricDescriptor_Type) {
-
-	require.Equal(t,
-		expectedMetric,
-		actualMetric.MetricDescriptor.Name,
-		"mismatching metric names",
-	)
-
-	require.NotEmpty(t,
-		actualMetric.MetricDescriptor.Description,
-		"empty description on metric",
-	)
-
-	require.Equal(t,
-		expectedType,
-		actualMetric.MetricDescriptor.Type,
-		"mismatching metric types",
-	)
-}
-
-// getLabelsMap returns a map of labels.
-func getLabelsMap(m *metricspb.Metric) map[string]string {
-	out := map[string]string{}
-	for i, k := range m.MetricDescriptor.LabelKeys {
-		out[k.Key] = m.Timeseries[0].LabelValues[i].Value
-	}
-
-	return out
-}