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Concerns from alpha-phase reviews have been addressed in https://github.com/kubernetes/kubernetes/pull/80320 and https://github.com/kubernetes/kubernetes/pull/82109 and early adopters have given positive feedback; so it seems there are no blockers to graduate GMSA support to beta. This patch also enables GMSA support by default, mainly for the sake of making it easier for cluster admins to use, as well as for e2e tests in nightly builds. Signed-off-by: Jean Rouge <rougej+github@gmail.com>