chore: add test for addpair #1228

Job	Run time
e2e-docker-build-e2e-init-chain	2m 31s
e2e-docker-build-babylon	2m 41s
lint_test / build	0s
docker_pipeline / prepare-metadata	1s
lint_test / check-mock-gen	0s
lint_test / gosec	0s
lint_test / integration-tests	0s
lint_test / lint	1m 29s
lint_test / unit-tests	4m 51s
docker_pipeline / docker_build (linux/amd64, ubuntu-24.04)	2m 50s
docker_pipeline / docker_build (linux/arm64, ubuntu-24.04-arm64)	2m 41s
e2e-run-btc-timestamping	4m 38s
e2e-run-btc-staking	5m 7s
e2e-run-ibc-transfer	4m 30s
e2e-run-btc-staking-pre-approval	4m 46s
e2e-run-upgrade-v1	4m 2s
docker_pipeline / merge_ecr	0s
docker_pipeline / merge_dockerhub	0s
	40m 7s

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