in v6.5.4, lightning failed at checksum stage when PD leader change

[lance6716]

Bug Report

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1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

3. What did you see instead (Required)

EOF
github.com/tikv/pd/client.(*client).processTSORequests
	/go/pkg/mod/github.com/tikv/pd/[email protected]/client.go:1090
github.com/tikv/pd/client.(*client).handleDispatcher
	/go/pkg/mod/github.com/tikv/pd/[email protected]/client.go:847
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594
github.com/tikv/pd/client.(*tsoRequest).Wait
	/go/pkg/mod/github.com/tikv/pd/[email protected]/client.go:1313
github.com/tikv/pd/client.(*client).GetTS
	/go/pkg/mod/github.com/tikv/pd/[email protected]/client.go:1333
github.com/pingcap/tidb/br/pkg/lightning/restore.(*tikvChecksumManager).Checksum
	/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/br/br/pkg/lightning/restore/checksum.go:315
github.com/pingcap/tidb/br/pkg/lightning/restore.DoChecksum
	/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/br/br/pkg/lightning/restore/checksum.go:161
github.com/pingcap/tidb/br/pkg/lightning/restore.(*TableRestore).postProcess
	/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/br/br/pkg/lightning/restore/table_restore.go:860
github.com/pingcap/tidb/br/pkg/lightning/restore.(*Controller).restoreTables.func7.1
	/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/br/br/pkg/lightning/restore/restore.go:1682
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594
fetch tso from pd failed

4. What is your TiDB version? (Required)

[lance6716]

lightning can reuse pd.IsLeaderChange to retry when PD side ports ErrClientTSOStreamClosed into release-6.5 which introduced in https://github.com/tikv/pd/pull/6160/files

[lance6716]