Dagger 0.14: Git credential helpers, exit code API, OCI annotations, and more

Dagger 0.14 introduces a powerful new way to authenticate against existing Git infrastructure, an API to better integrate with test tooling, and improved performance, CPU metrics, public traces, and more. The release includes native support for Git's credential management system, allowing developers to load modules from any Git repository with no additional configuration. Additionally, the release introduces an exit code API, which enables custom workflows that depend on non-standard exit codes, and supports setting custom OCI annotations on container images. Other improvements include global service hostnames, public traces, performance enhancements, and scoped enum values in the Go SDK. The release aims to provide greater flexibility for managing service dependencies and interconnections within modular workflows, as well as enhanced version control and reproducibility in builds.