fix: deploy Sensors to argo-events namespace TDE-1873 (#1178)

### Motivation

Argo Events sensor were deployed to the `argo` namespace while
associated `EventSource` are in `argo-events` namespace. It broke the
default assumptions of our Argo Events config. Aligning everything "Argo
Event" with the `argo-events` namespace makes it easier for managing
this deployment.
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### Modifications

Deploy `Sensors` to the `argo-events` namespace
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### Verification

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Author: paulfouquet

.github/workflows/main.yml

@@ -136,7 +136,7 @@ jobs:
 
           EVENTS=$(grep '^kind: Sensor$' -R events/ -H | cut -d ':' -f1)
           for evt in $EVENTS; do
-              kubectl apply -f "$evt" --namespace argo
+              kubectl apply -f "$evt" --namespace argo-events
           done
 
       - name: Install Argo