fix(ics): correct mainnet performance eligibility

[skhomuti]

Description

Fix mainnet CSM Experience eligibility evaluation:

• parse legacy v1 and current v2/v3 performance report structures without silent field fallbacks;
• discover the complete report history from DistributionLogUpdated events through the configured mainnet RPC and assessment cutoff;
• permanently qualify operators after they accumulate at least 30 days of actual attestation activity;
• evaluate performance exclusively against the latest report and its per-validator thresholds;
• fail loudly on missing required report fields, empty reports, and unsupported v3 log revisions;
• regenerate the mainnet eligibility artifact with 353 eligible operators.

The regenerated artifact contains 353 eligible operators, down from 411. It removes 58 operators that either fail the latest-report performance check or never accumulated 30 days of historical activity. No new operators are added relative to the existing artifact.

Checklist

• Appropriate PR labels applied
• Test coverage maintained (just coverage)
  • No need to add/update tests
  • Tests are added/updated
• Documentation maintained
  • No need to update
  • Updated

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