Add Tests for Serialization Methods in l1_block_info.go

[coderabbitai]

Following the recent structural changes to the struct, specifically the removal of the field, there's a need to ensure the serialization and deserialization logic ( and related methods) are correctly handling the updated structure. This issue tracks the addition of comprehensive tests for these methods to validate their functionality post-changes.

Context:

• PR: Update eigenda branch with polymer-develop #6
• Comment: Update eigenda branch with polymer-develop #6 (comment)

The tests should cover various scenarios to ensure robustness and reliability of the serialization logic under different conditions.