Fixes #2630

Description

This patch adds the complementary sparqlToMatrix2 method that uses the endpoint configuration data. The oldest patch adds the method, the newest uses it.

Caveats

None that I am aware of. The use seems to be limited to the author aspect, which is tested below.

Check any of the following which apply:

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

Testing

• Go to http://127.0.0.1:8100/author/Q5443996
• Scroll down to Topics-works matrix
• Check if the matrix shows up properly
• (Optional) Repeat for other authors)

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)