ipn/{ipnauth,ipnlocal,ipnserver}, client/tailscale: make ipnserver.Server testable

We update client/tailscale.LocalClient to allow specifying an optional Transport
(http.RoundTripper) for LocalAPI HTTP requests, and implement one that injects
an ipnauth.TestActor via request headers. We also add several functions and types
to make testing an ipn/ipnserver.Server possible (or at least easier).

We then use these updates to write basic tests for ipnserver.Server,
ensuring it works on non-Windows platforms and correctly sets and unsets
the LocalBackend's current user when a Windows user connects and disconnects.

We intentionally omit tests for switching between different OS users
and will add them in follow-up commits.

Updates tailscale/corp#25804

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

ipn/ipnauth/actor.go

@@ -4,6 +4,7 @@
 package ipnauth
 
 import (
+	"encoding/json"
 	"fmt"
 
 	"tailscale.com/ipn"
@@ -76,3 +77,15 @@ func (id ClientID) String() string {
 	}
 	return fmt.Sprint(id.v)
 }
+
+// MarshalJSON implements [json.Marshaler].
+// It is primarily used for testing.
+func (id ClientID) MarshalJSON() ([]byte, error) {
+	return json.Marshal(id.v)
+}
+
+// UnmarshalJSON implements [json.Unmarshaler].
+// It is primarily used for testing.
+func (id *ClientID) UnmarshalJSON(b []byte) error {
+	return json.Unmarshal(b, &id.v)
+}