Add end-to-end tests for TLS RPT report ingestion and WebSocket event handling

- Implemented tests for ingesting TLS RPT reports from emails and ensuring they are stored correctly in the database.
- Added tests to verify that the same report can be ingested multiple times without duplication.
- Created tests for backfilling reports that were previously delivered to the inbox.
- Developed WebSocket event handling tests to ensure events are correctly routed to subscribers based on mailbox ownership.
- Included tests for the mail API to validate session handling, mailbox isolation, and error mapping.
- Ensured that the API rejects unauthorized requests and handles malformed JSON gracefully.

services/webmail/messages/es.json

@@ -172,6 +172,7 @@
     "insertUrl": "Introduzca la URL:",
     "italic": "Cursiva",
     "junk": "Spam",
+    "reports": "Informes",
     "loadImages": "Cargar imágenes",
     "markRead": "Marcar como leído",
     "markUnread": "Marcar como no leído",