Show the response in markdown in test LLM page (buerokratt#317)

* prompt coniguration backend to be testing

* custom prompt configuration update and fixed Pyright issues

* fixed copilot reviews

* pre validation step added when user query is inserted

* added more validation cases

* fixed review comments

* feat: add react-markdown and remark-gfm for rendering markdown content in TestModel page

---------

Co-authored-by: nuwangeek <charith.bimsara@rootcode.io>
Co-authored-by: Charith Nuwan Bimsara <59943919+nuwangeek@users.noreply.github.com>
Co-authored-by: erangi-ar <erangika.ariyasena@rootcode.io>

Author: 3 people