Replace remaining !placeholder for Non-URL HTML outputs only in machine-name in ConfigSync

Problem/Motivation

See #2566503: [meta] Replace remaining !placeholder for Non-URL HTML outputs only

https://www.drupal.org/node/2566503#comment-10325457
https://www.drupal.org/node/2566503#comment-10334587

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes