Mitigate automountServiceAccountToken findings in Confluence

General MR

Summary

Closes #1857

This MR leverages the mutating Kyverno policy named update-automountserviceaccounttokens to harden all ServiceAccounts in the confluence namespace/package, and to place Pod exceptions where applicable (depending if the application truly needs access to the K8s API).

Justification for Pod exceptions are placed in comments alongside the code.

Manual testing according to the packages' DEVELOPMENT_MAINTENANCE.md has shown no loss of functionality.