chore: remove FOREST_ETH_RPC_COMPUTE_STATE_ON_INDEX_MISS workaround in snapshot tests and update affected snapshots

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

Reference issue to close (if applicable)

Closes #7118

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• Tests

  • Expanded ETH GetBlockReceipts test coverage to include Safe and Finalized block states in addition to existing cases
  • Updated test snapshot artifacts for ETH and Filecoin RPC methods with newer recorded data

• Refactor

  • Simplified state computation policy determination to rely exclusively on environment configuration settings

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.37%. Comparing base (cbdb13d) to head (488ce2a).
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/state_manager/state_computation.rs	77.15% <ø> (-1.19%)	⬇️

... and 10 files with indirect coverage changes

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