feat: add system tx hash indexing tests #343

Job	Run time
rust-library-base / Feature Checks	2m 21s
rust-library-base / Base Checks / Docs	2m 14s
rust-library-base / Base Checks / doctest	3m 19s
rust-library-base / Base Checks / Test Suite	5m 37s
rust-library-base / Base Checks / Rustfmt	35s
rust-library-base / Base Checks / Clippy	2m 44s
	16m 50s

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