Add support for configuring startup probes for argocd-image-updater template

[jespernylendklp]

Is your feature request related to a problem?

If, for whatever reason ArgoCD image-updater takes a long time to start, the probes fail, and the deployment will end up in a restart-loop.

Related helm chart

argocd-image-updater

Describe the solution you'd like

For some setups starting the argocd image updater takes a bit longer. For these cases it would be useful to be able to configure a startup probe.
This could be optional, as to be backwards compatible.

Describe alternatives you've considered

• increase or make other probe settings customizable

Additional context

https://github.com/argoproj/argo-helm/blob/main/charts/argocd-image-updater/templates/deployment.yaml#L145

[github-actions]

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