Prevent root from being recreated on react 18 (recreation of #1305) #550

Job	Run time
check_react_and_ujs (2.7)	58s
test (npm, npm, 2.7, base)	2m 6s
test (npm, npm, 2.7, shakapacker)	2m 20s
test (npm, npm, 2.7, sprockets_3)	1m 35s
test (npm, npm, 2.7, sprockets_4)	2m 40s
test (yarn_classic, yarn, 2.7, base)	1m 1s
test (yarn_classic, yarn, 2.7, shakapacker)	2m 48s
test (yarn_classic, yarn, 2.7, sprockets_3)	3m 15s
test (yarn_classic, yarn, 2.7, sprockets_4)	5m 12s
test (pnpm, pnpm, 2.7, base)	1m 5s
test (pnpm, pnpm, 2.7, shakapacker)	2m 10s
test (pnpm, pnpm, 2.7, sprockets_3)	1m 10s
test (pnpm, pnpm, 2.7, sprockets_4)	1m 21s
test (bun, bun, 2.7, base)	50s
test (bun, bun, 2.7, shakapacker)	1m 44s
test (bun, bun, 2.7, sprockets_3)	1m 15s
test (bun, bun, 2.7, sprockets_4)	1m 24s
	32m 54s

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