fix: hca download matrices and copy to clipboard buttons not working (#4628)

[frano-m]

Closes #4628.

This pull request updates the way matrix file URLs are handled in the HCA DCP project matrix mapping. The main change is a shift from using a generic url property to a more specifically named azul_url, ensuring clarity and consistency in how matrix file URLs are referenced and mapped throughout the codebase.

Matrix file URL property update:

• Changed the ProjectMatrixFileResponse interface in entities.ts to replace the url property with azul_url, clarifying the source and purpose of the URL.
• Updated the createMatrixView function in projectMatrixMapper.ts to destructure and use azul_url instead of url, and to map azul_url to the url property in the resulting view model. [1] [2]