Improve block proposal cancellation to (best effort) avoid concurrency issues#10219

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fab-10 wants to merge 2 commits intobesu-eth:mainfrom

fab-10:fix-cancelled-block-creation-exception

Commits on Apr 10, 2026

Fix concurrency issues when block proposal is cancelled during tx selection
fab-10
committed
Add unit tests for concurrency fixes and repair early-return regression
fab-10
committed

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