flaky test TestPlanReplayerWithMultiForeignKey

[hawkingrei]

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)

     dbtestkit.go:71: 
        	Error Trace:	pkg/testkit/dbtestkit.go:71
        	            				pkg/server/handler/optimizor/plan_replayer_test.go:334
        	Error:      	Received unexpected error:
        	            	open /tmp/plan_replayer.zip: no such file or directory
        	Test:       	TestPlanReplayerWithMultiForeignKey
        	Messages:   	sql:plan replayer load "/tmp/plan_replayer.zip", args:[]
    plan_replayer_test.go:313: 
        	Error Trace:	pkg/server/handler/optimizor/plan_replayer_test.go:313
        	            				GOROOT/src/runtime/panic.go:629
        	            				GOROOT/src/testing/testing.go:1006
        	            				pkg/testkit/dbtestkit.go:71
        	            				pkg/server/handler/optimizor/plan_replayer_test.go:334
        	Error:      	Received unexpected error:
        	            	remove /tmp/plan_replayer.zip: no such file or directory
        	Test:       	TestPlanReplayerWithMultiForeignKey 

4. What is your TiDB version? (Required)

[hawkingrei]

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/56719/fast_test_tiprow/1848196749366136832#1:build-log.txt%3A4366