[lexical-utils] Bug Fix: Refactor markSelection for getDOMSlot and not using updateDOM #1974

Job	Run time
core-tests / integrity (20.11.0)	2m 7s
core-tests / integrity (20.11.0)	2m 7s
core-tests / unit (18.18.0)	1m 49s
core-tests / unit (18.18.0)	1m 49s
core-tests / unit (18.18.0, beta)	2m 5s
core-tests / unit (18.18.0, beta)	2m 5s
e2e-tests / canary (ubuntu-latest, 18.18.0, chromium, rich-text, modern-events) / e2e-test	15m 54s
e2e-tests / canary (ubuntu-latest, 18.18.0, chromium, rich-text, modern-events) / e2e-test	15m 37s
	43m 33s

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