Duplicated Gitlab webhooks when using Eventsource with HA

[paolocarta]

Describe the bug

I have an EventSource with 2 replicas for different Gitlab events. The EventSource is responsible for creating the webhooks on the configured repos. When having HA we see duplicated webhooks, probably due to some concurrency issues between the replicas.

To Reproduce Steps to reproduce the behavior:

1. Create an EventSource with 2 replicas
2. Create a Gitlab event which creates a webhook
3. You will notice often duplicated hooks

Expected behavior I would expect not seeing duplicated webhooks in the repo.

Screenshots

Environment:

• Argo: v3.4.7
• Argo Events: v1.7.6

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