Chore: revert pngx pdf viewer to third party package (#6741)

src-ui/package.json

@@ -27,13 +27,13 @@
     "bootstrap": "^5.3.3",
     "file-saver": "^2.0.5",
     "mime-names": "^1.0.0",
+    "ng2-pdf-viewer": "^10.2.1",
     "ngx-bootstrap-icons": "^1.9.3",
     "ngx-color": "^9.0.0",
     "ngx-cookie-service": "^17.1.0",
     "ngx-file-drop": "^16.0.0",
     "ngx-filesize": "^3.0.3",
     "ngx-ui-tour-ng-bootstrap": "^14.0.2",
-    "pdfjs-dist": "^3.11.174",
     "rxjs": "^7.8.1",
     "tslib": "^2.6.2",
     "uuid": "^9.0.1",