Panic: sync: negative WaitGroup counter Occurs During Relay Peer Connection in TestRelayMessageTransmission

[AYAHASSAN287]

Description:

When running the TestRelayMessageTransmission test, we encounter the following panic related to the Go sync.WaitGroup:

This issue occurs during the execution of the GetNumConnectedRelayPeers API. The error appears right after successfully connecting nodes and attempting to subscribe to the relay topic.

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Steps to Reproduce:

1. Run the following test case:

   go test -v -run ^TestRelayMessageTransmission$ ./testlibs/waku-go-tests
   

Expected Behavior:

The test should complete successfully without any panic.
The GetNumConnectedRelayPeers API should return the correct number of connected peers without triggering WaitGroup errors.

Actual Behavior:

The test panics with the following error:

panic: sync: negative WaitGroup counter