client/rpc: small improvements #1809

Job	Run time
rust-docs	6m 43s
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	4m 15s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 46s
changelog	19s
build-binaries	11m 21s
check-packages	6m 1s
lints	5m 31s
test-ledger-app	6m 58s
test-wasm	7m 46s
test-unit	12m 30s
test-integration	21m 52s
check-benchmarks	11m 56s
test-e2e (0)	22m 56s
test-e2e (1)	19m 41s
test-e2e-with-device-automation	10m 1s
test-e2e (2)	23m 30s
test-e2e (3)	22m 50s
test-e2e (4)	24m 20s
upload-coverage	8s
	3h 42m 24s

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