Migrate demo artwork and fix all failing CI tests (#1459)

* Initial work on fixing tests

* Fix formatting

* Remove dead code to satisfy rustc warnings

* Insert into an artboard

* Load updated artwork in editor

* Remove popup when importing image

* Fix up demo art

* Change transform app[lication method

* Reduce number of enums called BlendMode

* Finalize the demo artwork upgrade

* Code review pass

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Co-authored-by: Keavon Chambers <keavon@keavon.com>

document-legacy/src/layers/layer_info.rs

@@ -1,4 +1,3 @@
-use super::blend_mode::BlendMode;
 use super::folder_layer::FolderLayer;
 use super::layer_layer::LayerLayer;
 use super::shape_layer::ShapeLayer;
@@ -7,6 +6,7 @@ use crate::intersection::Quad;
 use crate::DocumentError;
 use crate::LayerId;
 
+use graphene_core::raster::BlendMode;
 use graphene_core::vector::VectorData;
 use graphene_std::vector::subpath::Subpath;