RejectedExecutionException from CpsFlowExecution.getCurrentExecutions

[jglick]

Caught and logged as a warning from FlowExecutionList.StepExecutionIteratorImpl when trying to call StepExecution.applyAll at a certain point during shutdown, for example from DurableTaskStep$AgentReconnectionListener.check if an agent is disconnected. In fact that listener does check Jenkins.get().isTerminating() to avoid noise, but unfortunately this flag is set by Jenkins.cleanUp after running @Terminators (and before all other cleanup steps).

[jtnord]

Code looks fine - 4 failing tests on windows? timeout after 180s but other PRs seem to be OK.

[jglick]

Windows CI is just super slow and prone to timeouts.