Add cleanup_socket to AbstractEventLoop create_unix_server #15614

Job	Run time
stubtest: stdlib (macos-latest, 3.10)	43s
stubtest: stdlib (ubuntu-latest, 3.15)	49s
stubtest: stdlib (ubuntu-latest, 3.11)	45s
stubtest: stdlib (macos-latest, 3.13)	26s
stubtest: stdlib (macos-latest, 3.14)	30s
stubtest: stdlib (ubuntu-latest, 3.13)	38s
stubtest: stdlib (windows-latest, 3.14)	1m 3s
stubtest: stdlib (windows-latest, 3.11)	1m 20s
stubtest: stdlib (ubuntu-latest, 3.12)	40s
stubtest: stdlib (macos-latest, 3.15)	45s
stubtest: stdlib (windows-latest, 3.15)	1m 45s
stubtest: stdlib (macos-latest, 3.11)	31s
stubtest: stdlib (macos-latest, 3.12)	29s
stubtest: stdlib (windows-latest, 3.12)	1m 27s
stubtest: stdlib (windows-latest, 3.13)	1m 4s
stubtest: stdlib (ubuntu-latest, 3.10)	38s
stubtest: stdlib (ubuntu-latest, 3.14)	42s
	14m 15s

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