Merge branch '461723-extract-todo-component-for-design' into 'master'

Move todos button in shared component

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167333



Merged-by: Florie Guibert <fguibert@gitlab.com>
Approved-by: Jack Chapman <jachapman@gitlab.com>
Approved-by: Florie Guibert <fguibert@gitlab.com>
Reviewed-by: Florie Guibert <fguibert@gitlab.com>
Co-authored-by: Rajan Mistry <rmistry@gitlab.com>