Make all social accounts available using the /user API endpoint
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### Release notes
Add missing social accounts (Mastodon, Bluesky, ORCID) available in the `/user` API endpoint.
### Problem to solve
Some data (Mastodon, Bluesky, ORCID social accounts) cannot be retrieved using the `/user` API.
For instance, a Mastodon account is advertised on [my profile](https://gitlab.com/paternal/), yet, it does not appear in https://forge.apps.education.fr/api/v4/user.
### Proposal
See "Release notes".
### Intended users
Software developers using the API.
### Feature Usage Metrics
???
### Does this feature require an audit event?
???
issue