Reduce chances of race condition when closing connections to kill job #6035
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Rationale
A pipeline job may have closed its connection before the cancellation attempts to close it. We can detect this special case and avoid throwing an exception.
https://teamcity.labkey.org/buildConfiguration/LabkeyTrunk_DailyPostgres/3252738?expandBuildChangesSection=true&expandBuildDeploymentsSection=false&hideTestsFromDependencies=false&expandBuildTestsSection=true&hideProblemsFromDependencies=false
Changes