some cleanups #685

Job	Run time
rust_tests	1m 27s
clippy	1m 18s
build	1m 4s
configure	1s
tests_zemu_setup	44s
build_ledger	1m 26s
test_zemu (0, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/candid.test.ts)	10m 10s
test_zemu (1, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/protobuf.test.ts)	7m 45s
test_zemu (2, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/bls.test.ts)	3m 56s
test_zemu (3, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/standard.test.ts)	5m 4s
test_zemu (4, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/addresses.test.ts)	4m 35s
size_nano_s	1s
build_package_flex	0s
build_package_stax	0s
build_package_nanos	0s
build_package_nanosp	0s
	37m 31s

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