Fix calculation of `gasUsed` field returned on block endpoints

[m-Peter]

Closes: https://github.com/onflow/flow-evm-gateway/issues/443

Description

When calculating the block's gasUsed, we mistakenly used the gas limit set by the transaction author, and not the gasUsed from the transaction's receipt.

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For contributor use:

• [x] Targeted PR against master branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [x] Code follows the standards mentioned here.
• [x] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

Summary by CodeRabbit

• New Features

  • Enhanced gas calculation by utilizing transaction receipts for improved accuracy in block preparation.
  • Expanded testing framework to validate both transactions and their receipts, ensuring data integrity and robustness.

• Bug Fixes

  • Improved accuracy in total gas used calculations during block preparation, potentially resolving discrepancies in gas reporting.

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Commits

Files that changed from the base of the PR and between f084214f0f318a9f2ed2202bab836fcc08dd280c and 2ba5919c4db4667b8e6acbd71dd5ac231ed59635.

Walkthrough

The recent changes enhance the accuracy of the gas usage calculation in the blockchain API. The method prepareBlockResponse now relies on the GasUsed property from transaction receipts instead of the Gas property specified in transactions. This adjustment ensures that the gas consumed reflects actual usage during block execution. Additionally, test cases have been expanded to validate both transactions and their receipts, increasing the robustness of the testing framework.

Changes

Files	Change Summary
api/api.go	Modified prepareBlockResponse to calculate total gas used from the transaction receipt instead of the transaction.
tests/web3js/eth_non_interactive_test.js	Expanded tests to validate both transactions and their receipts, ensuring correct gas usage tracking.

Assessment against linked issues

Objective	Addressed	Explanation
Calculation of gasUsed field for blocks is inaccurate (#443)	✅

🐇 In the meadow, I hop with delight,
New gas calculations shine oh so bright!
From receipts we learn what truly was spent,
A clearer picture, our API's new intent.
With tests that are stronger, our code is now sound,
Hopping through changes, joyfully bound! 🌼✨

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