fix: right-click paste for images in clipboard (Issue #8826) (#8845)

* Fix right-click paste command for images (Issue #8826)

* Fix clipboard logic for multiple paste types

* fix: remove unused code

* refactor & robustness

* fix: creating paste event with image files

---------

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

packages/excalidraw/data/blob.ts

@@ -106,11 +106,15 @@ export const isImageFileHandle = (handle: FileSystemHandle | null) => {
   return type === "png" || type === "svg";
 };
 
+export const isSupportedImageFileType = (type: string | null | undefined) => {
+  return !!type && (Object.values(IMAGE_MIME_TYPES) as string[]).includes(type);
+};
+
 export const isSupportedImageFile = (
   blob: Blob | null | undefined,
 ): blob is Blob & { type: ValueOf<typeof IMAGE_MIME_TYPES> } => {
   const { type } = blob || {};
-  return !!type && (Object.values(IMAGE_MIME_TYPES) as string[]).includes(type);
+  return isSupportedImageFileType(type);
 };
 
 export const loadSceneOrLibraryFromBlob = async (