Hook exit only after descriptors are closed. Fixes #216 #624

Job	Run time
Platform (aarch64) / Build	6m 27s
Platform (x86_64) / Build	1m 8s
Test (x86_64) / Kernel (amazonlinux2)	7m 35s
Test (x86_64) / Kernel (centos)	2m 30s
Test (x86_64) / Kernel (debian)	6m 17s
Test (x86_64) / Kernel (fedora)	2m 58s
Test (x86_64) / Kernel (mainline)	12m 8s
Test (x86_64) / Kernel (rocky)	3m 17s
Test (x86_64) / Kernel (ubuntu-aws)	11m 17s
Test (x86_64) / Kernel (ubuntu-azure)	11m 5s
Test (x86_64) / Kernel (ubuntu-gcp)	8m 39s
Test (x86_64) / Kernel (ubuntu-gke)	2m 4s
Test (x86_64) / Kernel (ubuntu-oem)	5m 15s
Test (x86_64) / Kernel (ubuntu-oracle)	7m 24s
Test (aarch64) / Kernel (amazonlinux2)	45m 1s
Test (aarch64) / Kernel (debian)	7m 38s
Test (aarch64) / Kernel (fedora)	11m 37s
Test (aarch64) / Kernel (mainline)	1h 1m 26s
Test (aarch64) / Kernel (rocky)	7m 18s
Test (aarch64) / Kernel (ubuntu-aws)	46m 40s
Test (aarch64) / Kernel (ubuntu-azure)	47m 14s
Test (aarch64) / Kernel (ubuntu-gcp)	11m 4s
Test (aarch64) / Kernel (ubuntu-gke)	8m 43s
Test (aarch64) / Kernel (ubuntu-oracle)	35m 39s
CI Merge Auditor	1s
	6h 10m 25s

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