fix: shared channel test errcheck issues (#28551)

* fix: shared channel test errcheck issues

server/.golangci.yml

@@ -93,7 +93,7 @@ issues:
         channels/api4/saml.go|\
         channels/api4/scheme.go|\
         channels/api4/scheme_test.go|\
-        channels/api4/shared_channel_test.go|\
+        channels/api4/shared_channel.go|\
         channels/api4/status.go|\
         channels/api4/status_test.go|\
         channels/api4/system_local.go|\