Avoid flush in finalizers for `Socket` and `IO::FileDescriptor` #11994

Job	Run time
check_format	1m 39s
deploy_api_docs	0s
x86_64-gnu-test (1.7.3)	34m 7s
x86_64-gnu-test (1.8.2)	33m 57s
x86_64-gnu-test (1.9.2)	34m 19s
x86_64-gnu-test (1.10.1)	35m 31s
x86_64-gnu-test (1.11.2)	34m 3s
x86_64-gnu-test (1.12.2)	34m 16s
x86_64-gnu-test (1.13.1)	34m 37s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	31m 55s
x86_64-gnu-test-preview_mt	5m 44s
x86_64-musl-test	37m 8s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 31s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	33m 17s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 1s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	35m 54s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	36m 35s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 38s
	8h 45m 12s

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