Remove nexusRepositoryManager package from Big Bang umbrella

Summary

Remove the deprecated nexusRepositoryManager addon from the Big Bang umbrella chart. Users should migrate to the maintained NXRM-HA package for Nexus Repository Manager deployments.

Background

The legacy nexusRepositoryManager addon has been superseded by the nxrm-ha (Nexus Repository Manager High Availability) package, which is actively maintained and provides:

• High Availability support with multi-node configuration
• Production-ready architecture with external database and object storage support
• Enterprise clustering and replication
• Self-contained package with integration defaults baked in

Scope

Remove all nexusRepositoryManager references from:

• Chart templates, values, and schema
• Kyverno policies
• Unit tests and integration test values
• Documentation (package docs, config references, quick-start, backup/restore, SSO examples)
• NOTES.txt deprecation notices

Migration

Upgrading from the legacy nexus-repository-manager chart to nxrm-ha requires a migration process. This is NOT a simple in-place upgrade. See NXRM-HA MR#29 for upgrade notices.