Randomize padding bytes #2457

Job	Run time
ext-test	1s
check_release	2m 54s
linting	2m 30s
build-tx-sync (ubuntu-latest, stable)	4m 35s
build-tx-sync (macos-latest, beta)	4m 48s
check_docs	1s
build-tx-sync (ubuntu-latest, beta)	4m 41s
build-tx-sync (ubuntu-latest, 1.75.0)	5m 12s
build-tx-sync (macos-latest, 1.75.0)	6m 46s
build-tx-sync (macos-latest, stable)	5m 57s
build (windows-latest, stable)	15m 45s
build (self-hosted, stable)	1s
benchmark	5m 1s
build (self-hosted, 1.75.0)	1s
rustfmt	16s
build (self-hosted, beta)	31m 30s
fuzz	1s
build (macos-latest, 1.75.0)	11m 0s
build (macos-latest, stable)	11m 26s
coverage	1s
	1h 52m 27s

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