ipn/{ipnserver,localapi},tsnet: use ipnauth.Self as the actor in tsnet localapi handlers

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With #14843 merged, (*localapi.Handler).servePrefs() now requires a non-nil actor,
and other places may soon require it as well.

In this PR, we update localapi.NewHandler with a new required parameter for the actor.
We then update tsnet to use ipnauth.Self.

We also rearrange the code in (*ipnserver.Server).serveHTTP() to pass the actor via Handler's
constructor instead of the field.

Updates #14823

Signed-off-by: Nick Khyl <nickk@tailscale.com>

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