tsnet: remove AuthenticatedAPITransport (API-over-noise) support

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It never launched and I've lost hope of it launching and it's in my
way now, so I guess it's time to say goodbye.

Updates tailscale/corp#4383
Updates #17305

Change-Id: I2eb551d49f2fb062979cc307f284df4b3dfa5956
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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