JENKINS-27329 Less aggressive WorkspaceCleanupThread #3444
See JENKINS-27329 (https://issues.jenkins-ci.org/browse/JENKINS-27329).
I dare to claim that the default behaviour of WorkspaceCleanupThread is too aggressive => this little change is by no means perfect (or admittedly even far from perfect), but IMHO a saner or slightly more defensive default behaviour.
Mind that according to
Proposed changelog entries
Ad "The CI failure seems to be an ATH glitch, cc @raul-arabaolaza": I guess you refer to e.g. https://ci.jenkins.io/blue/organizations/jenkins/Core%2Fjenkins/detail/PR-3444/6/tests => https://issues.jenkins-ci.org/browse/JENKINS-51343