feat: remove metadata receipts and account balances

[meyer9]

The metadata field used to contain receipts and changed account balances as a performance optimization to be able to serve RPC requests without actually executing the block, but we still need to execute the block in most cases anyway. This removes the receipts and changed_account_balances fields from the response.

These are generated during flashblock execution instead.

This still preserves skipping execution of transactions that were executed in previous flashblocks as long as we have the receipt and state from the previous execution. In either the cached or executed path, cumulative_gas and next_log_index are updated.

The tests also needed to be fixed since they relied on the receipts for logs and the changed balances. Now, since the transactions are actually executed, we need to actually emit logs from the contracts when executed and send balance to the address rather than relying on changed_account_balances.

Fixes CHAIN-2657

[cb-heimdall]

✅ Heimdall Review Status

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[linear]

CHAIN-2657 Remove reliance on flashblock metadata receipts in node-reth

[refcell]

Non-blocking nit: maybe add a test

Approved review 3631920391 from refcell is now dismissed due to new commit. Re-request for approval.

[danyalprout]

Instead of making these optional, can we just remove the account balance/receipts completely? These are a holdover from the time when we didn't execute Flashblocks, but rather just stored them in a cache.

[meyer9]

I think most of the failing tests are due to relying on passed in receipts rather than actually executing. I'll need to update the EVM bytecode to actually emit logs instead of assuming the receipts are correct.

[meyer9]

Updated the PR to remove account balances as well (these should still serialize fine if they exist due to not using strict mode serde). Also, updated tests to actually emit logs instead of depending on receipts/balances passed in from the flashblock.

[refcell]

Very nice!

[cb-heimdall]

Review Error for refcell @ 2026-01-07 16:56:18 UTC
User failed mfa authentication, see go/mfa-help

[refcell]

oops forgot mfa

[meyer9]

resolved branch conflicts ^