Demote "failed to find device" error

Summary:
This is not actionable for us as it includes changing device identifiers.
In this case it's better to rely on individual user reports if this is about
a particular device/app combo.

Reviewed By: lawrencelomax

Differential Revision: D34749996

fbshipit-source-id: 88c6c8b076b3f7d9808b6a2a9b08854d2d7cb39f

desktop/flipper-ui-core/src/dispatcher/flipperServer.tsx

@@ -270,7 +270,7 @@ export async function handleClientConnected(
     getDeviceBySerial(store.getState(), query.device_id) ??
     (await findDeviceForConnection(store, query.app, query.device_id).catch(
       (e) => {
-        console.error(
+        console.warn(
           `[conn] Failed to find device '${query.device_id}' while connection app '${query.app}'`,
           e,
         );