Fix failing tests

- TestCardinalityQueryRequestValidationRoundTripper revert `model.NameValidationScheme` to `LegacyValidation`
- `TestStreamingChunkSeries_CreateIteratorTwice`: Quote label name in error message

pkg/frontend/querymiddleware/request_validation.go

@@ -7,8 +7,14 @@ import (
 	"net/http"
 
 	"github.com/grafana/dskit/cancellation"
+	"github.com/prometheus/common/model"
 )
 
+func init() {
+	// Mimir doesn't support Prometheus' UTF-8 metric/label name scheme yet.
+	model.NameValidationScheme = model.LegacyValidation
+}
+
 const requestValidationFailedFmt = "request validation failed for "
 
 var errMetricsQueryRequestValidationFailed = cancellation.NewErrorf(

pkg/querier/distributor_queryable_streaming_test.go

@@ -128,7 +128,7 @@ func TestStreamingChunkSeries_CreateIteratorTwice(t *testing.T) {
 
 	iterator = series.Iterator(iterator)
 	require.NotNil(t, iterator)
-	require.EqualError(t, iterator.Err(), `can't create iterator multiple times for the one streaming series ({the-name="the-value"})`)
+	require.EqualError(t, iterator.Err(), `can't create iterator multiple times for the one streaming series ({"the-name"="the-value"})`)
 }
 
 func createTestChunk(t *testing.T, time int64, value float64) client.Chunk {