refactor(DocumentController): remvoe Open endpoint and its client method

EnvelopeGenerator.Web/wwwroot/js/app.js

@@ -71,17 +71,8 @@ class App {
         try {
             this.signatureCount = this.currentDocument.elements.length
             await createAnnotations(this.currentDocument, this.Instance)
-
-            const openResponse = await this.Network.openDocument(this.envelopeKey)
-
-            if (openResponse.fatal || openResponse.error) {
-                return Swal.fire({
-                    title: 'Fehler',
-                    text: 'Umschlag konnte nicht geöffnet werden!',
-                    icon: 'error',
-                })
-            }
         } catch (e) {
+            console.error("Error loading annotations:", e);
         }
 
         //add click events of external buttons