Prevent multiple id attributes in SVG

[tauthomas01]

Issue

Some of the newest icon requests contain multiple id attributes that are unused.

Example of a multiple unused id instances:

Reference example

This is mostly due to SVG icons generated by vector applications such as Illustrator that keep its original layers. Having unused id is not necessary to keep in our end.

Proposed solution

We should have a test that rejects all id attributes except the <title> one because it's used to reference the aria-labelledby attribute for accessibility reason.