Use main image in canary events dag

Aqurequested to merge
T415874_use_main_airflow_image_in_canary_events_dag into main

Having a custom image for this dag is error prone. A dependency has been updated and the lag of the custom image crashed the pod at configuration read.

Also, since the creation of this dag, the creations of those images have moved in this project (blubber.yaml) and the main image do contains the requested jars. No need of an custom image.

This MR requires an update of the base image first https://gerrit.wikimedia.org/r/c/operations/deployment-charts/+/1249936

On deploy, please clear dag properties.

Bug: T415874

Edited by Aqu

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