fix: sort candidates inside ariadne_v2, to make it tolerant for unsorted inputs

[LGLO]

Description

Node is not sorting registered candidates and it never was doing it.
Ariadne v1 was sorting them. Ariadne v2 was not. This fixes this missing sorting in Ariadne v2.

ETCM-11891

Checklist

• Commit sequence broadly makes sense and commits have useful messages.
• The size limit of 400 LOC isn't needlessly exceeded
• The PR refers to a JIRA ticket (if one exists)
• New tests are added if needed and existing tests are updated.
• New code is documented and existing documentation is updated.
• Relevant logging and metrics added
• Any changes are noted in the changelog.md for affected crate
• Self-reviewed the diff