[XCMv5]Remove XCM testnet NetworkIds #4732

Job	Run time
preflight / preflight	45s
preflight / ci-versions	1m 6s
cargo-check-benches (master)	4m 50s
cargo-check-all-crate-macos	10m 9s
cargo-check-benches (current)	4m 43s
cargo-check-each-crate (1)	8m 30s
test-frame-ui	39m 49s
cargo-check-each-crate (2)	8m 38s
cargo-check-each-crate (3)	8m 37s
test-node-metrics	13m 29s
test-full-crypto-feature	2m 37s
cargo-check-each-crate (4)	8m 38s
cargo-check-each-crate (5)	8m 38s
cargo-check-each-crate (6)	8m 37s
cargo-check-each-crate (7)	8m 38s
test-frame-examples-compile-to-wasm	3m 0s
node-bench-regression-guard	6s
test-deterministic-wasm	7m 40s
check-tracing	2m 20s
check-metadata-hash	7m 46s
All test misc tests passed	1s
	2h 38m 37s

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