[indexer]: Cleanup large-object representation of genesis transaction

[tomxey]

Description of change

Cleanup large-object representation of genesis transaction

Links to any relevant issues

fixes #3974

Type of change

• Refactor

How the change has been tested

cargo ci-clippy
cargo test --profile simulator --package=iota-indexer --features shared_test_runtime
cargo nextest run -p iota-graphql-rpc --features pg_integration --no-fail-fast --test-threads 1

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

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