Bug 1777395 - Remove legacy clip-parenting in wrench r=gfx-reviewers,lsalzman

This removes the last piece of code in wrench and gecko (there is
one more callsite in WR itself) that relies on the legacy clip
parenting code.

Differential Revision: https://phabricator.services.mozilla.com/D150694

gfx/wr/wrench/reftests/tiles/tile-cache-raster-root.yaml

@@ -39,3 +39,5 @@ pipelines:
                 bounds: [0, 0, 1887, 239]
                 type: rect
                 color: blue
+                clip-chain: [2, 4]
+                

gfx/wr/wrench/src/yaml_frame_reader.rs

@@ -1894,7 +1894,10 @@ impl YamlFrameReader {
 
         if let Some(clip_rect) = yaml["bounds"].as_rect() {
             space_and_clip.clip_id = dl.define_clip_rect(
-                &space_and_clip,
+                &SpaceAndClipInfo {
+                    spatial_id: space_and_clip.spatial_id,
+                    clip_id: ClipId::ClipChain(ClipChainId::INVALID),
+                },
                 clip_rect,
             );
         }