feat: [IOCOM-2096] New lines on messages' IOMarkdown, when a br tag is encountered

[Vangaorth]

Short description

This PR adds support for multiple br tags on the rendering rules of messages, when using IOMarkdown.

List of changes proposed in this pull request

• br occurrences are converted into new line characters (only in message and precondition's markdown)
• Html node restored on message and precondition's markdown
• Rendering rules code refactored in order to be shared between standard and custom rules

How to test

Using the io-dev-api-server, check that every br produces a new line. You can use the following markdown

The first line<br>the second line<br/><br />a third line<br/><br/><br/>What we want is more lines<br/>\n<br/>\n<br/>\n<br/>Don't we?

[github-actions]

Jira Pull Request Link

This Pull Request refers to Jira issues:

• IOCOM-2096

[github-actions]

PR Title Validation for conventional commit type

✅ All good! PR title follows the conventional commit type.

[codecov]

Codecov Report

Attention: Patch coverage is 56.81818% with 19 lines in your changes missing coverage. Please review.

Project coverage is 51.01%. Comparing base (f66da68) to head (39f7d92).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...tures/common/components/IOMarkdown/customRules.tsx	33.33%	12 Missing ⚠️
ts/components/IOMarkdown/renderRules.tsx	72.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6783      +/-   ##
==========================================
+ Coverage   50.99%   51.01%   +0.02%     
==========================================
  Files        1579     1579              
  Lines       32706    32725      +19     
  Branches     7361     7367       +6     
==========================================
+ Hits        16679    16696      +17     
- Misses      15982    15984       +2     
  Partials       45       45              

Files with missing lines	Coverage Δ
ts/components/IOMarkdown/index.tsx	100.00% <ø> (ø)
.../messages/components/Home/PreconditionsContent.tsx	79.06% <100.00%> (+0.49%)	⬆️
ts/components/IOMarkdown/renderRules.tsx	68.29% <72.00%> (+2.23%)	⬆️
...tures/common/components/IOMarkdown/customRules.tsx	51.61% <33.33%> (+7.16%)	⬆️

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[CrisTofani]

LGTM