single attestation data

[anshalshukla]

🗒️ Description

Merge multiple payloads for a particular attestation_data while block building.

🔗 Related Issues or PRs

✅ Checklist

• Ran tox checks to avoid unnecessary CI fails:

  uvx tox

• Considered adding appropriate tests for the changes.
• Considered updating the online docs in the ./docs/ directory.

[anshalshukla]

I've removed a few testcase which were testing the greedy selection while block building, those can be added back but will need to separate out the core block_build as a separate function.