add elu op #4814

Job	Run time
pytester (ubuntu-22.04, 3.10, latest, core)	12m 34s
pytester (ubuntu-22.04, 3.10, latest, ops)	33m 37s
pytester (ubuntu-22.04, 3.10, nightly, core)	13m 55s
pytester (ubuntu-22.04, 3.10, nightly, ops)	34m 38s
pytester (macOS-14, 3.10, latest, core)	9m 32s
pytester (macOS-14, 3.10, latest, ops)	26m 25s
pytester (macOS-14, 3.10, nightly, core)	10m 3s
pytester (macOS-14, 3.10, nightly, ops)	26m 31s
pytester (windows-2022, 3.10, latest, core)	24m 16s
pytester (windows-2022, 3.10, nightly, core)	26m 15s
pytester (ubuntu-22.04, 3.11, latest)	24m 54s
pytester (ubuntu-22.04, 3.12, latest)	28m 40s
testing-guardian	1s
	4h 31m 21s

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