Bot UI: ignore unsafe HTML tags in Markdown renderer

Description

Updates the Markdown renderer to ignore potentially unsafe HTML tags. The following tags are now ignored:

1. style
2. script
3. iframe
4. link
5. meta
6. form
7. input

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc)
• MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED