feat: Allow Jellyfin Guids with dashes for import-from-jellyfin endpoint

[its-wizza]

Description

• Allows GUIDs with hyphens as post data to import-from-jellyfin endpoint to align with Jellyfin standards where both with and without dashes is supported (with dashes is preferred)
• Don't think any other endpoints are affected by the change to support these Jellyfin Guids
• Fixes API support for Jellyfin Guid with dashes #2338
• Note: Used AI as a starting point for code

How Has This Been Tested?

Built locally, connected to Jellyfin server and sent POST request to import-from-jellyfin endpoint with Guid with dashes, successfully added user

Screenshots / Logs (if applicable)

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• [N/A] I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• [N/A] Translation keys pnpm i18n:extract
• [N/A] Database migration (if required)