Add xcm upm mock endpoint and tests #5052

Job	Run time
set-tags	7s
check-copyright	6s
cargo-clippy	10m 26s
Check with rustfmt	13s
cargo-toml-feature-propagation	1m 54s
toml-formatting	53s
typescript-formatting	23s
typescript-linting	17s
build	4m 27s
rust-test	20m 12s
typescript-tests	4m 3s
check-api-augment	1m 10s
typescript-tests-simple-template	2m 34s
typescript-tests-flashbox	3m 42s
typescript-tests-frontier	3m 53s
Check WASM runtimes with Twiggy	1m 34s
chopsticks-upgrade-test (stagenet_dancebox, dancebox)	47s
docker-tanssi (tanssi)	1m 1s
chopsticks-upgrade-test (flashbox, flashbox)	44s
docker-tanssi (container-chain-simple-template)	1m 5s
chopsticks-upgrade-test (dancebox, dancebox)	39s
docker-tanssi (container-chain-evm-template)	1m 0s
typescript-dancebox-specs	28s
chopsticks-upgrade-test (frontier_template, container-chain-template-frontier)	47s
docker-tanssi (starlight)	42s
chopsticks-upgrade-test (stagelight, dancelight)	1m 20s
typescript-tests-relay	4m 3s
zombienet-test-upgrade (dancebox)	3m 23s
zombienet-tests (zombie_tanssi)	9m 26s
zombienet-test-upgrade-containers (frontier_template, container-chain-template-frontier)	4m 34s
zombienet-tests (zombie_tanssi_parathreads)	15m 16s
zombienet-test-upgrade-starlight (dancelight, dancelight)	1m 28s
zombienet-test-upgrade-containers (simple_template, container-chain-template-simple)	5m 10s
zombienet-tests (zombie_tanssi_rotation)	9m 3s
zombienet-tests (zombie_tanssi_warp_sync)	6m 52s
zombienet-tests (zombie_tanssi_relay)	10m 33s
zombienet-tests (zombie_data_preservers)	13m 38s
	2h 27m 53s

Provide feedback