fix(migrations): add instructions to bring back custom_migration_cuto… #1666

Job	Run time
execution-plan / execution_plan	34s
execution-plan / infrastructure/docker/builder - Build and Publish	1m 22s
execution-plan / infrastructure/docker/git-ssh - Build and Publish	25s
execution-plan / services/cd-service - Build and Publish	5m 40s
execution-plan / services/cloudrun-service - Build and Publish	3m 10s
execution-plan / pkg - Build and Publish	3m 15s
execution-plan / services/manifest-repo-export-service - Build and Publish	3m 39s
execution-plan / services/rollout-service - Build and Publish	6m 31s
execution-plan / services/frontend-service - Build and Publish	7m 27s
execution-plan / cli - Build and Publish	1m 9s
execution-plan / Cleanup	7s
integration-tests / integration-test	5m 22s
trivy-scan / trivy	57s
	39m 38s

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