Backport fix staking benchmark (#6463) to stable 2412 and disable flaky tests #16932

Job	Run time
check-dependency-rules	8s
check-fail-ci	15s
check-markdown	15s
check-workspace	24s
preflight / preflight	44s
preflight / ci-versions	53s
check-toml-format	59s
check-rust-feature-propagation	1m 56s
check-umbrella	2m 14s
fmt	1m 3s
test-rust-features	2m 8s
All quick checks passed	1s
	11m 0s

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