Add illegal characters to schema linter #1501
Description
Description
To avoid the use of illegal characters in the schema, I would like to update the schema linter so that it highlights characters that should not be used (e.g., "`")
An example of why this could be useful can be found in this PR: #1499
Acceptance Criteria
- A list of illegal chars is defined
- The schema linter has been updated to catch these characters