Refactoring & CI fixes #568

Job	Run time
check_react_and_ujs (2.7)	54s
test (npm, npm, 2.7, base)	1m 15s
test (npm, npm, 2.7, shakapacker)	1m 56s
test (npm, npm, 2.7, sprockets_3)	1m 40s
test (npm, npm, 2.7, sprockets_4)	1m 26s
test (yarn_classic, yarn, 2.7, base)	59s
test (yarn_classic, yarn, 2.7, shakapacker)	1m 52s
test (yarn_classic, yarn, 2.7, sprockets_3)	1m 28s
test (yarn_classic, yarn, 2.7, sprockets_4)	4m 22s
test (pnpm, pnpm, 2.7, base)	56s
test (pnpm, pnpm, 2.7, shakapacker)	1m 46s
test (pnpm, pnpm, 2.7, sprockets_3)	11m 26s
test (pnpm, pnpm, 2.7, sprockets_4)	1m 28s
test (bun, bun, 2.7, base)	51s
test (bun, bun, 2.7, shakapacker)	1m 31s
test (bun, bun, 2.7, sprockets_3)	1m 19s
test (bun, bun, 2.7, sprockets_4)	1m 17s
	36m 26s

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