allow custom static and media urls in html export

[viseshrp]

No description provided.

[viseshrp]

@margalva Please don't approve yet. I will let you know when the tests are fixed.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 78.66667% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.06%. Comparing base (d6c3488) to head (27d3cdb).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../dynamicreporting/core/serverless/html_exporter.py	78.08%	6 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #407      +/-   ##
==========================================
+ Coverage   81.01%   81.06%   +0.04%     
==========================================
  Files          28       28              
  Lines        7824     7890      +66     
  Branches     1455     1466      +11     
==========================================
+ Hits         6339     6396      +57     
  Misses       1028     1028              
- Partials      457      466       +9     

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[viseshrp]

@margalva Tests have been fixed. Please take a look when you can.