Custom properties of the solution are not shown in excel report

[jmcolmenar]

Describe the bug
The custom properties of the solution are not shown in excel report, but they are successfully displayed in the JSON files.

To Reproduce
Add custom properties to a solution and run experiments.

Expected behavior
Include custom properties in excel report.

What happens instead
Custom properties do not appear in excel file.

Screenshots / Code snippets
Not needed

Versions (ignore not applicable ones):

• OS: OSX and Linux
• Java version: 20
• Browser (if frontend bug): NA
• Mork version (if released, if not commit reference): v0.18

Additional context
Not needed

[rmartinsanta]

Currently working on this feature, will be added to the new Excel generator.