Resolve "Remove @mixin btn-primary from buttons.scss"
What does this MR do and why?
Removes all references to btn-primary from GitLab project
"btn-primary" is a deprecated class class that is now replaced with "btn-default", "btn-confirm" and other variant options. As there are no longer any references to "btn-primary" in any .vue or .haml files, this MR removes the last few remaining references.
There are no screenshots as "btn-primary" is no longer used in GitLab at all.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
How to set up and validate locally
Search entire project for "btn-primary" and ensure there are no remaining references (excluding archives or bootstrap files)
Numbered steps to set up and validate the change are strongly suggested.
Related to #474647 (closed)