Small clean-up for `EnsureForParachain` stuff #7232

Job	Run time
preflight / preflight	42s
preflight / ci-versions	1m 0s
cargo-check-all-crate-macos	2m 30s
cargo-check-benches (master)	1m 45s
cargo-check-benches (current)	1m 45s
cargo-check-each-crate (1)	1m 45s
test-frame-ui	1m 45s
cargo-check-each-crate (2)	1m 44s
test-full-crypto-feature	1m 45s
test-node-metrics	1m 44s
cargo-check-each-crate (3)	1m 44s
cargo-check-each-crate (4)	1m 44s
cargo-check-each-crate (5)	1m 44s
cargo-check-each-crate (6)	30s
cargo-check-each-crate (7)	31s
node-bench-regression-guard	1s
test-frame-examples-compile-to-wasm	1s
check-tracing	1s
test-deterministic-wasm	1s
check-metadata-hash	1s
All test misc tests passed	1s
	22m 44s

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