A guide to the breaking changes in GitLab 18.0

This post details the removal of the "Limit access from your project" setting for CI/CD job tokens, the default enforcement of the "Authorized groups and projects" allowlist, and the requirement for specific scopes (`read_registry`, `write_registry`) for Dependency Proxy tokens. It also announces the deprecation of Terraform CI/CD templates in favor of OpenTofu components and the end of support for PostgreSQL 14 and 15, mandating PostgreSQL 16 as the minimum version for GitLab 18.0. Additionally, it outlines changes to container image pull policy enforcement and introduces data retention limits for vulnerabilities on GitLab.com Ultimate.