feat: Enhance reference validation and add support for Handle URLs

- Updated reference validation to handle various identifier types including DOI, ISBN, ISSN, URN, and Handle.
- Improved regex patterns for DOI and Handle validation to correctly extract and validate identifiers from URLs.
- Added asynchronous checks to verify the existence of DOI and Handle URLs.
- Added asynchronous checks to verify the existence of  ISBNs
- Included detailed comments explaining the regex patterns and validation logic.
- Adjusted the validation logic to handle any URL prefix for Handle identifiers.
- Ensured that the Handle format `handle/20.500.12854/36478` is correctly validated.
- Updated the CI workflow to trigger on push and pull request events.

public/assets/manifest.json

@@ -98,6 +98,5 @@
   "assets/images/marker-icon.png": "http://localhost:8080/assets/images/marker-icon.2b3e1faf.png",
   "assets/images/layers-2x.png": "http://localhost:8080/assets/images/layers-2x.8f2c4d11.png",
   "assets/images/layers.png": "http://localhost:8080/assets/images/layers.416d9136.png",
-  "assets/images/Close.svg": "http://localhost:8080/assets/images/Close.e4887675.svg",
-  "assets/vendors-node_modules_vue-facing-decorator_dist_esm_index_js-node_modules_vue-facing-decorator-818045.js": "http://localhost:8080/assets/vendors-node_modules_vue-facing-decorator_dist_esm_index_js-node_modules_vue-facing-decorator-818045.js"
+  "assets/images/Close.svg": "http://localhost:8080/assets/images/Close.e4887675.svg"
 }