feat: use a proxy for the registration #1133

Job	Run time
deny	44s
lint	17s
docker	4m 49s
clippy	5m 0s
build	4m 59s
contract-integration-tests (macos-latest)	9m 26s
contract-integration-tests (ubuntu-latest)	3m 51s
parachain-integration-tests (ubuntu-latest)	4m 59s
parachain-integration-tests (macos-latest)	4m 45s
coverage	56s
unit-tests	4m 40s
documentation-tests	5m 3s
	49m 29s

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