fix(signals): prevent duplicate connect requests

the ws state might not be OPEN when connect is called thus leading to
multiple connect calls being done. it should be sufficient to check that
we have the ws instance when starting to connect.

Signed-off-by: Hellgren Heikki <heikki.hellgren@op.fi>

.changeset/loud-clocks-obey.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-signals': patch
+---
+
+Fixed multiple signal connection attempts when there are multiple subscriptions at the same time

plugins/signals/src/api/SignalClient.ts

@@ -135,7 +135,7 @@ export class SignalClient implements SignalApi {
   }
 
   private async connect() {
-    if (this.ws && this.ws.readyState === WebSocket.OPEN) {
+    if (this.ws && this.ws.readyState !== WebSocket.CLOSED) {
       return;
     }