Update Lodestar to allow full blocks to be proposed if a blinded block is not received from MEV-Boost in time

[boulder225]

🎯 Problem to be solved

The current Lodestar configuration uses the builderonly flag, which can lead to missed block proposals if MEV-Boost fails to produce a builder block in time. This approach increases the risk of missed blocks due to MEV-Boost issues.

🛠️ Proposed solution

• Update the Lodestar configuration to use the builderalways flag instead of builderonly
• Implement the change to allow full blocks to be proposed if a blinded block is not received from MEV-Boost in time
• Test the new configuration to ensure it works correctly with produceBlockV3