revert: restore party/external/service.ts to pre-multisync state

Signed-off-by: jarekr-da <jaroslaw.ratajski@digitalasset.com>

Author: jarekr-da

sdk/wallet-sdk/src/wallet/namespace/party/external/service.ts

@@ -32,7 +32,7 @@ export class ExternalPartyNamespace {
             this.resolveParticipantUids(
                 options?.confirmingParticipantEndpoints ?? []
             ),
-            options?.synchronizerId || this.findGlobalSynchronizer(),
+            options?.synchronizerId || this.resolveSynchronizerId(),
         ]).then(
             ([
                 observingParticipantUids,
@@ -79,7 +79,7 @@ export class ExternalPartyNamespace {
         )
     }
 
-    private async findGlobalSynchronizer() {
+    private async resolveSynchronizerId() {
         const connectedSynchronizers =
             await this.ctx.ledgerProvider.request<Ops.GetV2StateConnectedSynchronizers>(
                 {
@@ -92,16 +92,19 @@ export class ExternalPartyNamespace {
                 }
             )
 
-        const global = connectedSynchronizers.connectedSynchronizers?.find(
-            (s) => s.synchronizerAlias === 'global'
-        )
-        if (!global) {
-            throw new Error(
-                'Global synchronizer not found among connected synchronizers'
+        if (!connectedSynchronizers.connectedSynchronizers?.[0]) {
+            throw new Error('No connected synchronizers found')
+        }
+
+        const synchronizerId =
+            connectedSynchronizers.connectedSynchronizers[0].synchronizerId
+        if (connectedSynchronizers.connectedSynchronizers.length > 1) {
+            this.logger.warn(
+                `Found ${connectedSynchronizers.connectedSynchronizers.length} synchronizers, defaulting to ${synchronizerId}`
             )
         }
 
-        return global.synchronizerId
+        return synchronizerId
     }
 
     /**