chore: Refactor upload placeholder (#5898)

shared/editor/queries/findAttachmentById.ts

@@ -1,23 +0,0 @@
-import { EditorState } from "prosemirror-state";
-
-const findAttachmentById = function (
-  state: EditorState,
-  id: string
-): [number, number] | null {
-  let result: [number, number] | null = null;
-
-  state.doc.descendants((node, pos) => {
-    if (result) {
-      return false;
-    }
-    if (node.type.name === "attachment" && node.attrs.id === id) {
-      result = [pos, pos + node.nodeSize];
-      return false;
-    }
-    return true;
-  });
-
-  return result;
-};
-
-export default findAttachmentById;