feat(station): prune external canister request #2724

Job	Run time
Build canister (control-panel, control_panel)	1m 32s
deployment-test:required	8m 15s
Build canister (upgrader, upgrader)	1m 33s
Build canister (station, station)	3m 28s
Download Canister (icp_ledger, ledger-canister)	5s
prod-deployment-test:required	16m 59s
test-node:required	1m 36s
Download Canister (icp_index, ic-icp-index-canister)	4s
test-rust:required	2m 0s
Download Canister (cmc, cycles-minting-canister)	4s
integration-tests:required	14m 5s
	49m 41s

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