refactor: remove version 20 migrations #7491

Job	Run time
build	4m 43s
lint	1m 53s
analyze	4s
test	15m 17s
e2e-windows-subset	12m 38s
e2e (ubuntu-latest, 22, npm, 0)	11m 17s
e2e (ubuntu-latest, 22, npm, 1)	8m 57s
e2e (ubuntu-latest, 22, npm, 4)	9m 53s
e2e (ubuntu-latest, 22, esbuild, 0)	9m 8s
e2e (ubuntu-latest, 22, esbuild, 1)	9m 46s
e2e (ubuntu-latest, 22, npm, 5)	11m 29s
e2e (ubuntu-latest, 22, npm, 2)	10m 0s
e2e (ubuntu-latest, 22, npm, 3)	8m 2s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	9m 14s
e2e (ubuntu-latest, 22, esbuild, 3)	9m 9s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 15s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 8s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 54s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 3s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	5m 59s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	5m 52s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 12s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 42s
e2e-snapshots	0s
	3h 1m 35s

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