fix(html): Produce valid HTML output in Prowler v3

[rieck-srlabs]

Description

Prowler (v3) failed to produce valid HTML outputs. There were

• tags not closed
• attributes not placed in double quotes
• text elements not properly HTML-escaped
• superfluous </div> elements

Browsers don't seem to mind, but I was experimenting with modifying the generated HTML and ran into issues with XML parsers not accepting the output.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.96%. Comparing base (15133f2) to head (4c14af6). Report is 11 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #3863      +/-   ##
==========================================
+ Coverage   85.87%   85.96%   +0.08%     
==========================================
  Files         706      706              
  Lines       21852    21853       +1     
==========================================
+ Hits        18766    18785      +19     
+ Misses       3086     3068      -18     

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