chore: use l2 block rpc

[refcell]

Description

Use the l2 rpc url in the engine client to fetch the l2 block ref.

[refcell]

📚 $\text{Stack Overview}$

Pulls submitted in this stack:

• chore(engine): Rename EngineApiError #134
• chore: use l2 block rpc #133 👈
• main

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 43 lines in your changes missing coverage. Please review.

Project coverage is 23.4%. Comparing base (2de14d9) to head (b8e476c).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/engine/src/controller.rs	0.0%	26 Missing ⚠️
crates/engine/src/client.rs	0.0%	16 Missing ⚠️
crates/driver/src/driver.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

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