docs: release notes for the v21.0.0-rc.2 release #9855

Job	Run time
analyze	5s
build	2m 10s
lint	2m 27s
build-e2e-windows-subset	2m 26s
test	5m 50s
e2e (ubuntu-latest, 22, npm, 0)	11m 5s
e2e (ubuntu-latest, 22, npm, 2)	11m 20s
e2e (ubuntu-latest, 22, npm, 5)	10m 25s
e2e (ubuntu-latest, 22, npm, 1)	11m 41s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	8m 24s
e2e (ubuntu-latest, 22, esbuild, 1)	9m 29s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 57s
e2e (ubuntu-latest, 22, esbuild, 0)	8m 6s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 43s
e2e (ubuntu-latest, 22, npm, 3)	8m 43s
e2e (ubuntu-latest, 22, npm, 4)	8m 49s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 26s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 11s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 10s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 31s
e2e (ubuntu-latest, 22, esbuild, 5)	7m 32s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 51s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 22s
e2e-snapshots	0s
e2e-windows-subset	4m 24s
	2h 47m 7s

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