SVG importer ignores `clipPath` applied to a group

[NicTanghe]

Description

The SVG importer does not respect a clipPath applied to a group. Content that should be cropped to the clipping shape is imported without clipping. follow up of #4329

Steps to reproduce

1. Open clip-path.svg in a browser or another SVG viewer. It appears as a blue circle because a circle clips a larger square.
2. Import the same file into Graphite.
3. Compare the imported result with the browser rendering.

Expected behavior

Only the circular portion of the blue square is visible, matching the SVG rendering in a browser.

Actual behavior

The clipping path is ignored and the full blue square is visible.