Adapting Auto DevOps & managed apps to Helm repo changes

What this post added

This post details how GitLab Auto DevOps and Managed Apps were adapted to the deprecation and removal of the Helm Stable repository. The mitigation involved switching to a GitLab-maintained Helm Stable Archive repository. Specific version upgrades for `auto-deploy-image` and `cluster-applications` are provided as solutions for users experiencing pipeline failures.