util/syspolicy, ipn: add "tailscale debug component-logs" support

Fixes #13313
Fixes #12687

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

ipn/backend.go

@@ -238,6 +238,7 @@ type StateKey string
 var DebuggableComponents = []string{
 	"magicsock",
 	"sockstats",
+	"syspolicy",
 }
 
 type Options struct {

ipn/ipnlocal/local.go

@@ -583,6 +583,8 @@ func (b *LocalBackend) SetComponentDebugLogging(component string, until time.Tim
 				}
 			}
 		}
+	case "syspolicy":
+		setEnabled = syspolicy.SetDebugLoggingEnabled
 	}
 	if setEnabled == nil || !slices.Contains(ipn.DebuggableComponents, component) {
 		return fmt.Errorf("unknown component %q", component)