control, ipn, tailcfg: enable seamless key renewal by default

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Previously, seamless key renewal was an opt-in feature.  Customers had
to set a `seamless-key-renewal` node attribute in their policy file.

This patch enables seamless key renewal by default for all clients.

It includes a `disable-seamless-key-renewal` node attribute we can set
in Control, so we can manage the rollout and disable the feature for
clients with known bugs.  This new attribute makes the feature opt-out.

Updates tailscale/corp#31479

Signed-off-by: Alex Chan <alexc@tailscale.com>

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