feat(profile): add --operator-channel and --catalog-source flags

[jangel97]

Summary

• Add --operator-channel flag to override the OLM subscription channel per operator (e.g. --operator-channel serverless-operator=candidate)
• Add --catalog-source flag to use a custom index image per operator (e.g. --catalog-source nfd=quay.io/my-team/index:test), creating a CatalogSource CR automatically
• Validation runs before infrastructure provisioning to fail fast on invalid inputs
• Override logic is centralized in installOperator() — no profile files need changes
• Docs updated with usage examples and operator package name reference table

Test plan

• Build passes
• Validation catches empty keys/values before provisioning
• End-to-end test with --operator-channel override
• End-to-end test with --catalog-source override

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