Remove JMX Trans support

[scholzj]

Type of change

• Task

Description

As proposed and approved on SP#43, this PR removes the support for JMX Trans from Strimzi. It leaves only minimal support required for uninstalling JMX Trans and the APIs which are deprecated and will be ignored, but have to stay present for backwards compatibility reasons.

This PR does following tasks:

• Removes the JMX Trans container image build
• Updates the Helm Chart and YAML installation files and removes JMX Trans from them
• Updates the JmxTransReconciler to delete the JMX Trans resources (Deployment, Config Map, Service Account) regardless whether .spec.jmxTrans is set or not
• Deprecates the JMX Trans methods from Pod Security Provider interface and removes the implementations in the existing plugins
• Removes JMX Trans from docs (leaves a notice about the removal and the API docs still remains but is marked as deprecated)
• Removes JMX Trans from system tests
• Removes the JMX Trans example
• And more

This should resolve #7692.

Checklist

• Make sure all tests pass
• Update documentation
• Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally
• Reference relevant issue(s) and close them after merging
• Update CHANGELOG.md

[scholzj]

/azp run regression

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[PaulRMellor]

LGTM. A couple of suggestions on descriptions.