Need Support for Schema-Less Benchmarks

[MiguelAFH]

Description:
Currently, leaderboard schemas must be manually modified for a new benchmark to appear in leaderboards. This manual step increases the effort and friction required when adding benchmarks, making the process more error-prone and less scalable.

Proposed Improvement:
A RunSpec should be sufficient to provide all the information needed for a leaderboard schema. If the RunSpec fully specifies the benchmark details, the system should be able to automatically generate or update the corresponding leaderboard entry without requiring manual schema edits.

Benefits:

• Reduces manual intervention when adding benchmarks.
• Ensures consistency between RunSpec definitions and leaderboard schemas.
• Lowers maintenance overhead for leaderboard management.
• Makes it easier for contributors to add new benchmarks.