6894 - Create ValidatedElement component and sanitized Markdown.

[RafaPolit]

fixes #6894

PR checklist:

• Update READ.me ?
• Update API documentation ?

QA checklist:

• Smoke test the functionality described in the issue
• Test for side effects
• UI responsiveness
• Cross browser testing
• Code review

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: app/react/Markdown/utils.js

Function	Unhandled Issue
logError	TypeError: t.includes is not a function find(app/... Event Count: 1 Affected Users: 11

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[Zasa-san]

I think the complexity of the recursive function is ok. It's readable.