cluster-components: Configure pod priority for remaining deployments

Merged Antoine R. Dumont requested to merge add-pod-priority-remaining-charts into production

This adapts the remaining chart cluster-components to install the priorities.

Note that as mentioned in comments, some deployments are not installing their priority (alertmanager, cert-manager, prometheus). within minikube. Even though, they do reference the means to install the priority (top-level key "priorityClassName"). Only blackbox-exporter behaved as documented. As does our templates deployment too (alertmanager-irc-relay).

This also realigns the differents charts (swh, software-stories) so they install their own priority classes (instead of having them centrally installed by the chart cluster-components).

Refs. swh/infra/sysadm-environment#4819 (closed)

Edited by Antoine R. Dumont

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