Prepare for Flux v2.0.0-rc.2

[stefanprodan]

The 2nd release candidate of Flux GA comes with bug fixes and improvements. This release marks source-controller, kustomize-controller and helm-controller as system-cluster-critical. This priority class will reduce the chances of Flux controllers being evicted before other non-critical workloads and prevents the pods from being permanently unavailable.

TODOs:

• Run conformance tests for Kubernetes 1.27 #3795
• Set priority class for the critical Flux components #3802
• Fix bootstrap for Bitbucket Server #3821
• Fix SOPS azkv envCred kustomize-controller#838
• Index receivers using webhook path as key notification-controller#506
• receiver/v1: Remove deprecated .status.url field notification-controller#508
• Add InclusionList to Alert CRD notification-controller#515
• Add support for commit signing PGP key passphrases image-automation-controller#510
• Fix nil pointer deref during diff attempt helm-controller#672
• Update Helm to v3.11.3 helm-controller#673

Release checklist:

• source-controller v1.0.0-rc.2
• kustomize-controller v1.0.0-rc.2
• notification-controller v1.0.0-rc.2
• helm-controller: v0.32.2
• image-reflector-controller v0.27.1
• image-automation-controller v0.33.0
• flux2 v2.0.0-rc.2
• terraform-provider-flux v1.0.0-rc.2

Documentation:

• Publish Flux release change log to GitHub & Slack