polkadot-service: Fix flaky tests #5101

Job	Run time
preflight / preflight	44s
preflight / ci-versions	1m 1s
test-full-crypto-feature	2m 34s
cargo-check-benches (master)	20m 43s
test-frame-ui	46m 24s
cargo-check-benches (current)	22m 7s
cargo-check-all-crate-macos	11m 32s
cargo-check-each-crate (1)	18m 55s
test-node-metrics	10m 34s
cargo-check-each-crate (2)	19m 31s
cargo-check-each-crate (3)	8m 21s
cargo-check-each-crate (4)	16m 58s
cargo-check-each-crate (5)	25m 7s
cargo-check-each-crate (6)	14m 44s
cargo-check-each-crate (7)	28m 27s
test-frame-examples-compile-to-wasm	3m 8s
test-deterministic-wasm	6m 28s
check-tracing	2m 23s
check-metadata-hash	6m 14s
node-bench-regression-guard	13s
All test misc tests passed	1s
	4h 26m 9s

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