Sync vale rules across all projects

Issue Description

We've made significant updates to vale over the last few weeks and months, and some of these changes are required for the localization team now.

• gitlab-runner: gitlab-org/gitlab-runner!5549 (merged)
• omnibus-gitlab: gitlab-org/omnibus-gitlab!8396 (merged)
• charts: gitlab-org/charts/gitlab!4255 (merged)
• gitlab-operator: gitlab-org/cloud-native/gitlab-operator!1151 (merged)