Set sectional_codeowners -> default_enabled: true
What does this MR do?
sectional_codeowners
flag controls which parsing method we use on CODEOWNERS
files. It has been enabled on gitlab-com/www-gitlab-com
and gitlab-org/gitlab
for several days without incident, and we have confidence that we can ship this feature as default_enabled
in %13.2
Closes #218756 (closed)