chore(release): cut the v5.21.0 release #8218

Job	Run time
build	2m 6s
e2e-tests (+(a11y\|security\|bugs)/*/cy.js)	4m 23s
e2e-tests (features/*/+(o\|d).cy.js)	4m 54s
e2e-tests (features/*/m.cy.js)	2m 58s
e2e-tests (features/*/!(o\|d\|m).cy.js)	4m 38s
	18m 59s

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