Add validation for hidden characters in catalog item definition

Jaydip Pansuriyarequested to merge
579778-ai-catalog-hidden-character-validation into master

What does this MR do and why?

Related Issues

  1. https://gitlab.com/gitlab-org/gitlab/-/work_items/579778
  2. https://gitlab.com/gitlab-org/gitlab/-/issues/580050

Related MR

  1. https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/5569

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