fix hangs in CI due to unbounded wait in Vmm:drop() caused by undelivered signals due to resource leak#5943

Manciukic wants to merge 4 commits into

firecracker-microvm:mainfirecracker-microvm/firecracker:mainfrom

Manciukic:debug-unittest-timeoutManciukic/firecracker:debug-unittest-timeoutCopy head branch name to clipboard