🌱 Add e2e test for operator workload persistence after catalog deletion

[camilamacedo86]

This PR adds a comprehensive e2e test to verify that installed operators continue functioning normally after their source catalog is deleted. This ensures catalogs are only needed for installation and upgrades, not for runtime operation.

What The Test Validates After Catalog Deletion
1. CSV Stability

• CSV remains in Succeeded state

2. Deployment Health

• Deployment not recreated
• All replicas available and ready

3. OLM Configuration Management

• Config: Add TEST_ENV_VAR=test-value via Subscription.Spec.Config.Env
• Behavior: OLM injects env var into deployment container
• Proves: OLM reconciliation works without catalog

4. Auto-Healing

• Delete pod manually
• Deployment controller recreates it
• Pod returns to Running
• Proves: Kubernetes controllers work normally

5. Metadata Integrity

• Subscription tracks installed CSV
• CRD exists

[openshift-ci]

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