logictest: raise TxnLivenessThreshold for multitenant configs

Logic tests are flaky due to overload when running in multitenant mode.
This patch increases the threshold for transaction heartbeat timeouts,
which will make it less likely for foreground operations to be aborted
by background jobs like the span config reconciler or the job registry
loop to reclaim jobs from dead sessions.

Release note: None

pkg/sql/logictest/BUILD.bazel

@@ -59,6 +59,7 @@ go_library(
         "//pkg/kv/kvclient/rangefeed",
         "//pkg/kv/kvserver",
         "//pkg/kv/kvserver/kvserverbase",
+        "//pkg/kv/kvserver/txnwait",
         "//pkg/multitenant/tenantcapabilities",
         "//pkg/security/username",
         "//pkg/server",

pkg/sql/logictest/logic.go

@@ -42,6 +42,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/kv/kvclient/rangefeed"
 	"github.com/cockroachdb/cockroach/pkg/kv/kvserver"
 	"github.com/cockroachdb/cockroach/pkg/kv/kvserver/kvserverbase"
+	"github.com/cockroachdb/cockroach/pkg/kv/kvserver/txnwait"
 	"github.com/cockroachdb/cockroach/pkg/multitenant/tenantcapabilities"
 	"github.com/cockroachdb/cockroach/pkg/security/username"
 	"github.com/cockroachdb/cockroach/pkg/server"
@@ -1709,6 +1710,21 @@ func (t *logicTest) newCluster(
 					t.Fatal(err)
 				}
 			}
+			if _, err := conn.Exec(
+				"RESET CLUSTER SETTING kv.closed_timestamp.target_duration",
+			); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := conn.Exec(
+				"RESET CLUSTER SETTING kv.closed_timestamp.side_transport_interval",
+			); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := conn.Exec(
+				"RESET CLUSTER SETTING kv.rangefeed.closed_timestamp_refresh_interval",
+			); err != nil {
+				t.Fatal(err)
+			}
 		}
 
 		capabilities := toa.capabilities
@@ -4353,6 +4369,18 @@ func RunLogicTest(
 	if *printErrorSummary {
 		defer lt.printErrorSummary()
 	}
+	if config.UseSecondaryTenant == logictestbase.Always {
+		// Under multitenant configs running in EngFlow, we have seen that logic
+		// tests can be flaky due to an overload condition where schema change
+		// transactions do not heartbeat quickly enough. This allows background jobs
+		// such as the spanconfig reconciler or the job registry "remove claims from
+		// dead sessions" loop.
+		// See https://github.com/cockroachdb/cockroach/pull/140400#issuecomment-2634346278
+		// and https://github.com/cockroachdb/cockroach/issues/140494#issuecomment-2640208187
+		// for a detailed analysis of this issue.
+		cleanup := txnwait.TestingOverrideTxnLivenessThreshold(30 * time.Second)
+		defer cleanup()
+	}
 	// Each test needs a copy because of Parallel
 	serverArgsCopy := serverArgs
 	serverArgsCopy.ForceProductionValues = serverArgs.ForceProductionValues || nonMetamorphicBatchSizes