[ExportReportPdf] Convert entity's description from markdown to HTML

[Powlinett]

Proposed changes

• add cmarkgfm library
• convert entity description field to HTML before injecting it into template
• replace <p> tag by <div> in case’s template to ensure consistent display

Related issues

• 2735

Checklist

• [x] I consider the submitted work as finished
• [x] I tested the code for its functionality using different use cases
  • run bandit on markdown lib's code
  • run pip-audit on connector's requirements
• [ ] I added/update the relevant documentation (either on github or on notion)
• [ ] Where necessary I refactored code to improve the overall quality

Further comments

Incident response's description used for tests:

**Incident from Harfanglab Incidents**  
1. first item  
    first description
2. second item  
    second desc  

### GFM

#### Autolink literals

www.example.com, https://example.com, and contact@example.com.

#### Footnote

A note[^1]

[^1]: Big note.

#### Strikethrough

~one~ or ~~two~~ tildes.

#### Table

| a | b  |  c |  d  |
| - | :- | -: | :-: |

#### Tasklist

* [ ] to do
* [x] done

output:

Useful resources

cmarkgfm lib doc: https://pypi.org/project/pycmarkgfm/