Remove rbac for additional fluentd config and plugins configmaps

[OlleLarsson]

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What kind of PR is this?

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• kind/feature
• kind/improvement
• kind/deprecation
• kind/documentation
• kind/clean-up
• kind/bug
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Important

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• kind/admin-change
• kind/dev-change
• kind/security
• [kind/adr](set-me)

Application Developer notice

RBAC to modify the configmaps fluentd-extra-config and fluentd-extra-plugins, and to delete any fluentd pod in the fluentd namespace has been removed.
Reach out to a platform administrator if any additional config or plugins are needed!

What does this PR do / why do we need this PR?

The additional fluentd configmaps are a security vulnerability.
This PR removes the RBAC for application developers so that they no longer have the permissions to add arbitrary fluentd config or plugins.

• Fixes #

Information to reviewers

Checklist

• Proper commit message prefix on all commits
• Change checks:
  • The change is transparent
  • The change is disruptive
  • The change requires no migration steps
  • The change requires migration steps
  • The change updates CRDs
  • The change updates the config and the schema
• Documentation checks:
  • The public documentation required no updates
  • The public documentation required an update - [link to change](set-me)
• Metrics checks:
  • The metrics are still exposed and present in Grafana after the change
  • The metrics names didn't change (Grafana dashboards and Prometheus alerts required no updates)
  • The metrics names did change (Grafana dashboards and Prometheus alerts required an update)
• Logs checks:
  • The logs do not show any errors after the change
• PodSecurityPolicy checks:
  • Any changed Pod is covered by Kubernetes Pod Security Standards
  • Any changed Pod is covered by Gatekeeper Pod Security Policies
  • The change does not cause any Pods to be blocked by Pod Security Standards or Policies
• NetworkPolicy checks:
  • Any changed Pod is covered by Network Policies
  • The change does not cause any dropped packets in the NetworkPolicy Dashboard
• Audit checks:
  • The change does not cause any unnecessary Kubernetes audit events
  • The change requires changes to Kubernetes audit policy
• Falco checks:
  • The change does not cause any alerts to be generated by Falco
• Bug checks:
  • The bug fix is covered by regression tests

[lunkan93]

👍