Use AbortAllOtherCommunicationOnFabric in RemoveFabric. (#19910)

This prevents establishment of new sessions for the fabric, and shuts down other
communication on the sessions that do exist, which our old setup did not use to
do.

Fixes #9642

src/app/clusters/operational-credentials-server/operational-credentials-server.cpp

@@ -476,28 +476,6 @@ void MatterOperationalCredentialsPluginServerInitCallback(void)
     DeviceLayer::PlatformMgrImpl().AddEventHandler(OnPlatformEventHandler);
 }
 
-namespace {
-class FabricCleanupExchangeDelegate : public chip::Messaging::ExchangeDelegate
-{
-public:
-    CHIP_ERROR OnMessageReceived(chip::Messaging::ExchangeContext * ec, const PayloadHeader & payloadHeader,
-                                 System::PacketBufferHandle && payload) override
-    {
-        return CHIP_NO_ERROR;
-    }
-    void OnResponseTimeout(chip::Messaging::ExchangeContext * ec) override {}
-    void OnExchangeClosing(chip::Messaging::ExchangeContext * ec) override
-    {
-        SessionManager * sessionManager = ec->GetExchangeMgr()->GetSessionManager();
-        FabricIndex currentFabricIndex  = ec->GetSessionHandle()->GetFabricIndex();
-        CleanupSessionsForFabric(*sessionManager, currentFabricIndex);
-    }
-};
-
-FabricCleanupExchangeDelegate gFabricCleanupExchangeDelegate;
-
-} // namespace
-
 bool emberAfOperationalCredentialsClusterRemoveFabricCallback(app::CommandHandler * commandObj,
                                                               const app::ConcreteCommandPath & commandPath,
                                                               const Commands::RemoveFabric::DecodableType & commandData)
@@ -543,15 +521,7 @@ bool emberAfOperationalCredentialsClusterRemoveFabricCallback(app::CommandHandle
         FabricIndex currentFabricIndex        = commandObj->GetAccessingFabricIndex();
         if (currentFabricIndex == fabricBeingRemoved)
         {
-            // If the current fabric is being removed, don't expire the secure sessions immediately as they are
-            // still needed to send a pending message generated by emberAfSendImmediateDefaultResponse().
-            // Hijack the exchange delegate here (as no more messages should be received on this exchange),
-            // and wait for it to close, before expiring the secure sessions for the fabric. Also, suppress MRP
-            // usage since the MRP engine still holds an exchange even after it's closed, and the engine references
-            // the associated session object.
-            // TODO: https://github.com/project-chip/connectedhomeip/issues/9642
-            ec->SetAutoRequestAck(false);
-            ec->SetDelegate(&gFabricCleanupExchangeDelegate);
+            ec->AbortAllOtherCommunicationOnFabric();
         }
         else
         {