fix(ethexe-service): Fix flaky validators_election test

[ark0f]

No description provided.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
ethexe/service/src/tests/utils/env.rs	15% smaller

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses flakiness in the validators_election test by improving how the network service processes events within the test environment. By ensuring the service reacts to block synchronization events, the test setup becomes more robust and predictable.

Highlights

• Test Stability: Updated the network service loop in the test environment to handle observer events.
• Event Synchronization: Integrated a tokio::select! block to process BlockSynced events, ensuring the chain head is correctly updated during test execution.

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[gemini-code-assist]

Code Review

This pull request updates the test environment in ethexe/service/src/tests/utils/env.rs to concurrently monitor network service events and observer events using a tokio::select! loop. When a block synchronization event is received, the network service's chain head is updated. The review feedback suggests improving error handling by replacing the .expect() call with the ? operator when updating the chain head.