test: Remove some main code modifications in EETS

[Mdaiki0730]

Proposed changes

We will remove some parts of the eets main code that added global variables and update it in the test engine.

• Remove GasLimitInExecutionSpecTest
• Remove UseKaiaCancunExtCodeHashFee
• Remove IsPragueInExecutionSpecTest
• Calculate the gas price based on the given base fee
• Self decode to convert to kaia's eth tx type

Types of changes

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• Bugfix
• New feature or enhancement
• Others

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• Lint and unit tests pass locally with my changes ($ make test)
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Further comments

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