test(spanner): skip/remove oc span related tests (googleapis#11260)

I removed the obvious open census tests that were failing in googleapis#11257. Some others it was not clear to me if these functions should be instrumented with OT or not, so I skipped them for now and will let the spanner team decide what to do with those tests.

Related: googleapis#11230

spanner/client_test.go

@@ -5028,6 +5028,7 @@ func transactionOptionsTestCases() []TransactionOptionsTestCase {
 }
 
 func TestClient_DoForEachRow_ShouldNotEndSpanWithIteratorDoneError(t *testing.T) {
+	t.Skip("open census spans are no longer exported by gapics")
 	// This test cannot be parallel, as the TestExporter does not support that.
 	te := itestutil.NewTestExporter()
 	defer te.Unregister()
@@ -5072,6 +5073,7 @@ func TestClient_DoForEachRow_ShouldNotEndSpanWithIteratorDoneError(t *testing.T)
 }
 
 func TestClient_DoForEachRow_ShouldEndSpanWithQueryError(t *testing.T) {
+	t.Skip("open census spans are no longer exported by gapics")
 	// This test cannot be parallel, as the TestExporter does not support that.
 	te := itestutil.NewTestExporter()
 	defer te.Unregister()
@@ -5902,6 +5904,7 @@ func checkBatchWriteSpan(t *testing.T, errors []error, code codes.Code) {
 	}
 }
 func TestClient_BatchWrite_SpanExported(t *testing.T) {
+	t.Skip("open census spans are no longer exported by gapics")
 	testcases := []struct {
 		name   string
 		code   codes.Code

spanner/oc_test.go

@@ -31,24 +31,6 @@ import (
 	structpb "google.golang.org/protobuf/types/known/structpb"
 )
 
-// Check that stats are being exported.
-func TestOCStats(t *testing.T) {
-	DisableGfeLatencyAndHeaderMissingCountViews()
-	te := testutil.NewTestExporter()
-	defer te.Unregister()
-
-	_, c, teardown := setupMockedTestServer(t)
-	defer teardown()
-
-	c.Single().ReadRow(context.Background(), "Users", Key{"alice"}, []string{"email"})
-	// Wait until we see data from the view.
-	select {
-	case <-te.Stats:
-	case <-time.After(1 * time.Second):
-		t.Fatal("no stats were exported before timeout")
-	}
-}
-
 func TestOCStats_SessionPool(t *testing.T) {
 	skipUnsupportedPGTest(t)
 	DisableGfeLatencyAndHeaderMissingCountViews()