Delete Repository#gitlab_ci_yml method
What does this MR do and why?
This MR deletes the Repository#gitlab_ci_yml
method.
This method is not used anymore after the changes made for
#26169.
This method was deprecated before in favor of
the Project#has_ci_config_file?
method.
Implementation table: #26169
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.
Related to #26169