server: skip TestDrain under testrace

Informs: cockroachdb#86974

Release note: None

Release justification: test only change

pkg/server/drain_test.go

@@ -23,6 +23,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/sql"
 	"github.com/cockroachdb/cockroach/pkg/testutils"
 	"github.com/cockroachdb/cockroach/pkg/testutils/serverutils"
+	"github.com/cockroachdb/cockroach/pkg/testutils/skip"
 	"github.com/cockroachdb/cockroach/pkg/testutils/sqlutils"
 	"github.com/cockroachdb/cockroach/pkg/testutils/testcluster"
 	"github.com/cockroachdb/cockroach/pkg/util/grpcutil"
@@ -37,6 +38,7 @@ import (
 // TestDrain tests the Drain RPC.
 func TestDrain(t *testing.T) {
 	defer leaktest.AfterTest(t)()
+	skip.UnderRaceWithIssue(t, 86974, "flaky test")
 	defer log.Scope(t).Close(t)
 	doTestDrain(t)
 }