Hook exit only after descriptors are closed. Fixes #216 #625

Job	Run time
Platform (aarch64) / Build	7m 9s
Platform (x86_64) / Build	1m 15s
Test (x86_64) / Kernel (amazonlinux2)	7m 16s
Test (x86_64) / Kernel (centos)	2m 32s
Test (x86_64) / Kernel (debian)	6m 18s
Test (x86_64) / Kernel (fedora)	2m 54s
Test (x86_64) / Kernel (mainline)	11m 54s
Test (x86_64) / Kernel (rocky)	2m 48s
Test (x86_64) / Kernel (ubuntu-aws)	11m 20s
Test (x86_64) / Kernel (ubuntu-azure)	11m 23s
Test (x86_64) / Kernel (ubuntu-gcp)	8m 20s
Test (x86_64) / Kernel (ubuntu-gke)	1m 58s
Test (x86_64) / Kernel (ubuntu-oem)	5m 4s
Test (x86_64) / Kernel (ubuntu-oracle)	7m 27s
Test (aarch64) / Kernel (amazonlinux2)	43m 50s
Test (aarch64) / Kernel (debian)	7m 53s
Test (aarch64) / Kernel (fedora)	11m 32s
Test (aarch64) / Kernel (mainline)	1h 1m 23s
Test (aarch64) / Kernel (rocky)	7m 2s
Test (aarch64) / Kernel (ubuntu-aws)	46m 49s
Test (aarch64) / Kernel (ubuntu-azure)	45m 59s
Test (aarch64) / Kernel (ubuntu-gcp)	11m 41s
Test (aarch64) / Kernel (ubuntu-gke)	7m 41s
Test (aarch64) / Kernel (ubuntu-oracle)	35m 18s
CI Merge Auditor	1s
	6h 6m 47s

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