bug: duplicate events received when using multiple namespaces

### What happened?

When using FireFly with multiple namespaces, it seems that events of type "blockchain invoke succeeded" and "contract deploy succeeded" are always received multiple times. If I have 7 namespaces, the namespace that triggered the invoke/deploy receives the success event 7 times. Other namespaces don't receive the event at all (which is expected, as it should only be sent to the namespace that triggered it).

### What did you expect to happen?

I would expect only one copy of the "blockchain invoke succeeded" or "contract deploy succeeded" event to be delivered back to the namespace that triggered the request.

### How can we reproduce it (as minimally and precisely as possible)?

Create multiple namespaces and either deploy a contract or invoke a contract.

### Anything else we need to know?

_No response_

### OS version

```console
# On Linux:
$ cat /etc/os-release
# paste output here
$ uname -a
# paste output here

# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here
```