Add validation that there is only one fp key in delegation (#270) #1075

Job	Run time
e2e-docker-build-babylon	2m 37s
e2e-docker-build-e2e-init-chain	2m 38s
docker_pipeline / prepare-metadata	1s
lint_test / build	0s
lint_test / lint	2m 10s
lint_test / unit-tests	5m 17s
lint_test / gosec	0s
lint_test / integration-tests	0s
lint_test / check-mock-gen	0s
docker_pipeline / docker_build (linux/amd64, ubuntu-24.04)	3m 15s
docker_pipeline / docker_build (linux/arm64, ubuntu-24.04-arm64)	2m 52s
e2e-run-ibc-transfer	4m 42s
e2e-run-btc-staking-pre-approval	5m 8s
e2e-run-btc-timestamping	4m 40s
e2e-run-btc-staking	5m 17s
e2e-run-upgrade-v1	3m 55s
docker_pipeline / merge_ecr	0s
docker_pipeline / merge_dockerhub	0s
	42m 32s

Provide feedback