flaky test TestDoImport

[hawkingrei]

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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)

 === RUN   TestDoImport
    local_test.go:2048: 
        	Error Trace:	br/pkg/lightning/backend/local/local_test.go:2048
        	Error:      	Error "context canceled" does not contain "meet error when generateJobForRange again"
        	Test:       	TestDoImport
--- FAIL: TestDoImport (1.01s) 

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