Move segmented_control_button_group from main GitLab project to GitLab UI
Description
Based on &7261, we want to replace referenced to segmented_control
that use the radio-group
implementation.
In gitlab!84803 (merged), we introduced a segmented_control_button_group
component, so we can maintain the same abstracted interface, but use a button implementation. For simplicity's sake, we also trimmed out the auto selecting valid value behavior which is currently handled by segmented_control.
Let's move this vue_shared/...
segmented_control_button_group
component to GitLab UI