Add XCM benchmarks to collectives-westend #17558

Job	Run time
check-dependency-rules	8s
check-workspace	16s
check-fail-ci	13s
check-markdown	15s
check-readme	3m 5s
preflight / preflight	47s
preflight / ci-versions	1m 2s
fmt	1m 11s
check-rust-feature-propagation	2m 5s
check-toml-format	1m 5s
check-umbrella	2m 19s
test-rust-features	2m 4s
All quick checks passed	1s
	14m 31s

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