refactor: remove tx gas limit

[chengwenxi]

Summary by CodeRabbit

• Bug Fixes
  • Transaction gas limit cap now dynamically derives from the actual block gas limit instead of using a fixed limit value. This improves transaction gas limit handling to align with current block configurations.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The transaction gas limit cap in MorphEvm::new is now dynamically derived from the block's gas limit instead of using a fixed EIP-7825 Osaka 30M cap. The cfg_env.tx_gas_limit_cap is now set to input.block_env.gas_limit, making the transaction gas limit constraint dependent on the block configuration.

Changes

Cohort / File(s)	Summary
Gas Limit Cap Configuration crates/evm/src/evm.rs	Modified MorphEvm::new to derive tx_gas_limit_cap from block_env.gas_limit instead of using a hardcoded EIP-7825 Osaka 30M cap value.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A rabbit hops through blocks so tall,
Where gas limits once fixed, now dance with all,
Block-bound caps in harmony they flow,
Dynamic limits steal the show! 🐰⛽

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'refactor: remove tx gas limit' is vague about what is actually being changed; the PR derives tx gas limit cap from block gas limit rather than removing it entirely.	Consider a more descriptive title that clarifies the main change, such as 'refactor: derive tx gas limit cap from block gas limit' or 'refactor: use block gas limit for tx gas limit cap'.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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[chengwenxi]

set tx_gas_limit_cap in cfg