Beautifying our UI: Giving GitLab build features a fresh look

What this post added

This post details UI improvements to the pipeline detail page and pipeline list view, including redesigning the pipeline header for better usability and scannability, harmonizing badges and link styles, and linking runner numbers to the runner admin page. Tooltips and button text have also been improved for clarity. The technical implementation involved refactoring the pipeline header from HAML to Vue/GraphQL for better performance and maintainability, and improving the usability of button labels and tooltips.