Revert Merge branch remove-char-limitation-raw-masked-vars into master

Purpose of revert

!109008 (diffs) is suspected to be causing the following incident: gitlab-com/gl-infra/production#8292 (closed)

Checklist

• Create an issue to reinstate the merge request and assign it to the author of the reverted merge request.
• If the revert is to resolve a broken master' incident](https://about.gitlab.com/handbook/engineering/workflow/#broken-master), please read through the [Responsibilities of the Broken master` resolution DRI.
• Add the appropriate labels before the MR is created. We can skip CI/CD jobs only if the labels are added before the CI/CD pipeline is created.

Milestone info

• I am reverting something in the current milestone. No changelog is needed, and I've added a ~"regression:*" label.
• I am reverting something in a different milestone. A changelog is needed, and I've removed the ~"regression:*" label.

Related issues and merge requests