Fix masterchain ValueFlow burned fees and blackhole accounting

[Lapo4kaKek]

• Fix missing burned_fee accounting in masterchain ValueFlow
• Add executor level blackhole burn tracking and validator checks

[Copilot]

Pull request overview

This PR fixes masterchain ValueFlow burned fees accounting and adds executor-level blackhole burn tracking with validator checks. The changes implement proper tracking of burned fees when coins are sent to the configured blackhole account in the masterchain.

Changes:

• Added blackhole_burned field to Transaction struct to track burned value at transaction execution time
• Implemented calculate_burned_fees() method in BurningConfig to calculate fees that should be burned based on burn ratio
• Updated collator to properly account for burned fees both from imported shard fees and from masterchain transaction fees
• Implemented blackhole account detection and coin burning in the ordinary transaction executor for masterchain transactions
• Added validator checks to verify that ValueFlow.burned matches expected burned fees including blackhole burns
• Updated test helpers to account for blackhole_burned in balance verification

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/block/src/transactions.rs	Added blackhole_burned field to Transaction struct with getter/setter methods
src/block/src/config_params.rs	Added calculate_burned_fees() method to BurningConfig
src/executor/src/ordinary_transaction.rs	Implemented blackhole account detection and coin burning for masterchain transactions
src/executor/src/tests/test_ordinary_transaction.rs	Added comprehensive test for blackhole burning behavior
src/executor/src/tests/common/mod.rs	Updated balance verification helpers to account for blackhole_burned
src/node/src/validator/collator.rs	Updated fee accounting to properly handle burned fees from imports and transaction fees
src/node/src/validator/validate_query.rs	Added validation checks for burned ValueFlow with blackhole burn tracking

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