Refactoring & CI fixes #572

Job	Run time
check_react_and_ujs (2.7)	28s
test (npm, npm, 2.7, base)	57s
test (npm, npm, 2.7, shakapacker)	1m 44s
test (npm, npm, 2.7, sprockets_3)	11m 25s
test (npm, npm, 2.7, sprockets_4)	1m 18s
test (yarn_classic, yarn, 2.7, base)	1m 7s
test (yarn_classic, yarn, 2.7, shakapacker)	2m 18s
test (yarn_classic, yarn, 2.7, sprockets_3)	1m 21s
test (yarn_classic, yarn, 2.7, sprockets_4)	1m 25s
test (pnpm, pnpm, 2.7, base)	59s
test (pnpm, pnpm, 2.7, shakapacker)	1m 59s
test (pnpm, pnpm, 2.7, sprockets_3)	1m 15s
test (pnpm, pnpm, 2.7, sprockets_4)	1m 28s
test (bun, bun, 2.7, base)	56s
test (bun, bun, 2.7, shakapacker)	1m 41s
test (bun, bun, 2.7, sprockets_3)	11m 15s
test (bun, bun, 2.7, sprockets_4)	1m 16s
	42m 52s

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