feat: support acknowledged source namespace deletion

[tmshort]

Summary

Adds an explicit, opt-in path to delete the source namespace after a successful cross-namespace migration.

• Adds --acknowledge-namespace-delete and rejects unsafe flag combinations.
• Records the acknowledgment on the ClusterExtension.
• Deletes the source namespace only after target installation and OLMv0 cleanup.
• Extends dry-run and unit-test coverage for the destructive action.

Depends on

• migration-install-namespace-core

Validation

• go test ./migration/... -count=1

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📥 Commits

Reviewing files that changed from the base of the PR and between ef0fb14 and 607798f.

📒 Files selected for processing (6)

• migration/examples/cmd/migrate-operators-v0-to-v1/convert.go
• migration/examples/cmd/migrate-operators-v0-to-v1/convert_test.go
• migration/pkg/migration/migration.go
• migration/pkg/migration/namespace.go
• migration/pkg/migration/types.go
• migration/pkg/migration/unit_test.go

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