Downgrade log level for messages around notifs for rollout lifecycle "...trigger '<EVENT>' is not configured"

[meeech]

Summary

This concerns notifications around rollout lifecycle.

These messages are very noisy and dont feel like errors. they should be info (maybe warning?)

example message: time="2024-03-21T18:29:30Z" level=error msg="Failed to run trigger, trigger: on-scaling-replica-set, destination: {slack argo-rollouts-notifications}, namespace config: : trigger 'on-scaling-replica-set' is not configured"

even better would be fire once the first time and never again.

i want to do this work but first wanted to check if there is reason these are error level messages.

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[zachaller]

Yea this is a bug, the fix will probably be in notification-engine and is related to the self service namespaced notification support.