Enable drift detection for cluster HelmRelease

Closes #1812 (closed)

This MR enables drift detection and correction for cluster HelmRelease and makes the following changes to achieve it:

1. Ensure allowedAddressPairs defaults to an empty array when no value is provided - completed in sylva-projects/sylva-elements/helm-charts/sylva-capi-cluster!794 (merged)
2. Fix no_proxy drift in RKE2ControlPlane during Miniservice installation - completed in sylva-projects/sylva-elements/ci-tooling/ci-deployment-values!254 (merged)
3. Remove refresh-metal3machinetemplates unit from management-values - this unit is no longer needed as the drift correction will now handle correcting the image URL in the management cluster
4. Add exceptions in drift correction CI job to whitelist necessary changes:
   • Allow updates to Cluster resource to allow adding of the annotation cluster-maxunavailable.sylva.org/enabled as this is required
   • Allow updates to Metal3MachineTemplate resource as the image URL needs to be corrected for the management cluster by drift correction

Related reference(s)

Test coverage

CI configuration

Below you can choose test deployment variants to run in this MR's CI.

Click to open to CI configuration

Legend:

Icon	Meaning	Available values
☁️	Infra Provider	capd, capo, capm3
🚀	Bootstrap Provider	kubeadm (alias kadm), rke2
🐧	Node OS	ubuntu, suse
🛠️	Deployment Options	light-deploy, dev-sources, ha, misc, maxsurge-0, logging, no-logging
🎬	Pipeline Scenarios	Available scenario list and description

• 🎬 preview ☁️ capd 🚀 kadm 🐧 ubuntu
• 🎬 preview ☁️ capo 🚀 rke2 🐧 suse
• 🎬 preview ☁️ capm3 🚀 rke2 🐧 ubuntu
• ☁️ capd 🚀 kadm 🛠️ light-deploy 🐧 ubuntu
• ☁️ capd 🚀 rke2 🛠️ light-deploy 🐧 suse
• ☁️ capo 🚀 rke2 🐧 suse
• ☁️ capo 🚀 kadm 🐧 ubuntu
• ☁️ capo 🚀 kadm 🛠️ dev-sources 🐧 ubuntu
• ☁️ capo 🚀 rke2 🎬 rolling-update 🛠️ ha 🐧 ubuntu
• ☁️ capo 🚀 kadm 🎬 wkld-k8s-upgrade 🐧 ubuntu
• ☁️ capo 🚀 rke2 🎬 rolling-update-no-wkld 🛠️ ha 🐧 suse
• ☁️ capo 🚀 rke2 🎬 sylva-upgrade-from-1.4.x 🛠️ ha 🐧 ubuntu
• ☁️ capo 🚀 rke2 🎬 sylva-upgrade-from-1.4.x 🛠️ ha,misc 🐧 ubuntu
• ☁️ capo 🚀 rke2 🛠️ ha,misc 🐧 ubuntu
• ☁️ capm3 🚀 rke2 🐧 suse
• ☁️ capm3 🚀 kadm 🐧 ubuntu
• ☁️ capm3 🚀 kadm 🎬 rolling-update-no-wkld 🛠️ ha,misc 🐧 ubuntu
• ☁️ capm3 🚀 rke2 🎬 wkld-k8s-upgrade 🛠️ ha 🐧 suse
• ☁️ capm3 🚀 kadm 🎬 rolling-update 🛠️ ha 🐧 ubuntu
• ☁️ capm3 🚀 rke2 🎬 sylva-upgrade-from-1.4.x 🛠️ ha 🐧 suse
• ☁️ capm3 🚀 rke2 🛠️ misc,ha 🐧 suse
• ☁️ capm3 🚀 rke2 🎬 sylva-upgrade-from-1.4.x 🛠️ ha,misc 🐧 suse
• ☁️ capm3 🚀 kadm 🎬 rolling-update 🛠️ ha 🐧 suse
• ☁️ capm3 🚀 ck8s 🎬 no-wkld 🛠️ light-deploy 🐧 ubuntu

Global config for deployment pipelines

• autorun pipelines

• allow failure on pipelines

• record sylvactl events

Notes:

• Enabling autorun will make deployment pipelines to be run automatically without human interaction
• Disabling allow failure will make deployment pipelines mandatory for pipeline success.
• if both autorun and allow failure are disabled, deployment pipelines will need manual triggering but will be blocking the pipeline

Be aware: after configuration change, pipeline is not triggered automatically. Please run it manually (by clicking the run pipeline button in Pipelines tab) or push new code.