Description

This PR contains two changes that help us in our production environments:

• It adds a priorityClass to the sysdig-agent helm chart. It is created and also configured in the DaemonSet. This change is needed, because in situations when there are not enough resources available in the worker nodes, the sysdig-agent is one of the first pods that is preempted. The new priorityClass configures a higher priority so that this does not happen anymore. This is directly copied from how it is already handled for the logdna-agent: https://github.com/terraform-ibm-modules/terraform-ibm-observability-agents/blob/main/chart/logdna-agent/templates/priorityclass.yaml
• It adds the 25% maxUnavailable setting to the DaemonSet to speed up the rollout of changes. We have clusters that have more than 300 nodes and rolling out changes to that takes too much time, so we get terraform timeouts. This change solves that problem.

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