cert-manager-app release v3.0.0

⚠️ Attention: This major release contains breaking changes in user values! ⚠️ We decided to move the helm chart code moves closer to upstream. This means we’re pulling in the helm chart templates from the cert-manager repository and applying changes to ensure best compatibility to the Giant Swarm clusters. This results in some breaking changes in the chart values. Please review the upgrade guide to see if you’re affected.

Changed

• We aligned the chart templates to the upstream cert-manager chart v1.12.2. Please review the upgrade guide. (#316)