Revert the increased delay for the `wait:cng` job

What does this MR do and why?

Describe in detail what your merge request does and why.

• The last 4 CNG pipelines have taken 55 - 60 minutes: https://dev.gitlab.org/gitlab/charts/components/images/-/pipelines?scope=tags&page=1.
• Based on gitlab-com/gl-infra/delivery#2542 (comment 1075595934), CNG pipeline duration should be back to normal.

Author Check-list

• Has documentation been updated?