Remove prims.embedding and prims.embedding_backward #5789

Job	Run time
pytester (ubuntu-22.04, 3.10, latest, core)	12m 14s
pytester (ubuntu-22.04, 3.10, latest, ops)	11m 59s
pytester (ubuntu-22.04, 3.10, latest, grads)	21m 2s
pytester (ubuntu-22.04, 3.10, nightly, core)	12m 25s
pytester (ubuntu-22.04, 3.10, nightly, ops)	11m 59s
pytester (ubuntu-22.04, 3.10, nightly, grads)	21m 37s
pytester (macOS-14, 3.10, latest, core)	10m 19s
pytester (macOS-14, 3.10, latest, ops)	10m 57s
pytester (macOS-14, 3.10, latest, grads)	19m 13s
pytester (macOS-14, 3.10, nightly, core)	9m 46s
pytester (macOS-14, 3.10, nightly, ops)	11m 5s
pytester (macOS-14, 3.10, nightly, grads)	18m 46s
pytester (windows-2022, 3.10, latest, core)	24m 31s
pytester (windows-2022, 3.10, nightly, core)	27m 55s
pytester (ubuntu-22.04, 3.11, latest)	14m 21s
pytester (ubuntu-22.04, 3.12, latest)	17m 39s
testing-guardian	1s
	4h 15m 49s

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