add elu op #4866

Job	Run time
pytester (ubuntu-22.04, 3.10, latest, core)	10m 14s
pytester (ubuntu-22.04, 3.10, latest, ops)	32m 23s
pytester (ubuntu-22.04, 3.10, nightly, core)	11m 18s
pytester (ubuntu-22.04, 3.10, nightly, ops)	31m 36s
pytester (macOS-14, 3.10, latest, core)	6m 47s
pytester (macOS-14, 3.10, latest, ops)	27m 13s
pytester (macOS-14, 3.10, nightly, core)	6m 48s
pytester (macOS-14, 3.10, nightly, ops)	33m 4s
pytester (windows-2022, 3.10, latest, core)	23m 26s
pytester (windows-2022, 3.10, nightly, core)	24m 3s
pytester (ubuntu-22.04, 3.11, latest)	23m 48s
pytester (ubuntu-22.04, 3.12, latest)	28m 10s
testing-guardian	1s
	4h 18m 51s

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