improve offline tx handling #757

Job	Run time
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	4m 25s
rust-docs	7m 0s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 36s
build-binaries	9m 46s
changelog	17s
check-packages	6m 52s
lints	6m 3s
test-wasm	7m 50s
test-integration	16m 30s
test-unit	10m 38s
check-benchmarks	11m 27s
test-e2e (0)	23m 20s
test-e2e (1)	18m 56s
test-e2e (2)	23m 36s
test-e2e (3)	18m 29s
test-e2e (4)	18m 11s
upload-coverage	8s
	3h 7m 4s

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