fix(evm): seed the genesis account only if genesis block is not committed

[oXtxNt9U]

Summary

Problem

set_genesis_info writes the genesis account to storage whenever it is missing, outside any commit, on every boot and every proposal.

When the genesis leaves that account empty (snapshot genesis, or a premine of 0), the genesis block deletes it. Afterwards only nodes that restarted or proposed have it again, so the next transaction that touches it without adding value (e.g. a 0-value transfer) produces a different state root on nodes without the account. They reject the block with InvalidStateRoot, leaving relays stuck and stalling validators. Anyone can trigger it for the cost of a transfer.

Solution

Only write the genesis account while the genesis block is not yet committed. The genesis info is still loaded into memory every time. Genesis state roots are unchanged.

Tests

• Rust: the account is not re-created after the genesis commit, including on a new instance, which still loads the genesis info.
• evm-service: a node that re-initializes the genesis after the genesis commit computes the same state root as one that didn't.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.66%. Comparing base (c39bb16) to head (c60faee).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1524      +/-   ##
===========================================
+ Coverage    80.31%   80.66%   +0.35%     
===========================================
  Files          952      963      +11     
  Lines        17162    17656     +494     
  Branches      2599     2674      +75     
===========================================
+ Hits         13784    14243     +459     
- Misses        3373     3405      +32     
- Partials         5        8       +3     

Flag	Coverage Δ
contracts	91.95% <ø> (?)
packages	80.38% <100.00%> (+0.06%)	⬆️

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