🧪 [Testing Improvement] Add ArrayList Testing Coverage for Pop and Get

[void0x14]

🎯 What: The testing gap addressed was the lack of explicit testing for the ArrayList.pop and get functionality, particularly concerning out-of-bounds access and complex types.

📊 Coverage: The new tests cover:

• Popping elements of complex types (e.g., []const u8) and verifying their values.
• Confirming that pop appropriately decreases the length of the list and returns null when the list is fully empty.
• Verifying that get on an index returns null after that specific element has been popped.

✨ Result: A solid improvement in test coverage for echo-core-zig/src/data/arraylist.zig, ensuring reliable behavior and preventing potential out-of-bounds memory bugs in the future.

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PR created automatically by Jules for task 15054344163974065583 started by @ulac000000

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