Brad Fitzpatrick 55bb7314f2 control/controlclient: replace a status func with Observer interface
For now the method has only one interface (the same as the func it's
replacing) but it will grow, eventually with the goal to remove the
controlclient.Status type for most purposes.

Updates #1909

Change-Id: I715c8bf95e3f5943055a94e76af98d988558a2f2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2023-08-28 21:07:04 -07:00
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