test(protobuf): add tests for state_diff conversion #12396

Job	Run time
check-starknet_api-dependency	6s
clippy	50s
build-papyrus-utilities-image	13m 3s
check	31s
codecov	6m 15s
commitlint	13s
doc	37s
executable-run	2m 33s
executable-run-no-rpc	2m 22s
integration-test	2m 36s
random-table-test	16s
rustfmt	14s
test	5m 12s
test-no-rpc	53s
udeps	3m 12s
	38m 53s

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