Seamless key renewal has been the default in all clients since 1.90.
We retained the ability to disable it from the control plane as a
precaution, but we haven't seen any issues that require us to disable it.
We're now removing all the code for non-seamless key renewal, because we
don't expect to turn it on again, and indeed it's been untested in the
field for three releases so might contain latent bugs!
Updates tailscale/corp#33042
Change-Id: I4b80bf07a3a50298d1c303743484169accc8844b
Signed-off-by: Alex Chan <alexc@tailscale.com>