feat(mlflow): add support bundle wrapper chart for PostgreSQL operator

[kriscoleman]

Parent epic: #166
Integration branch: feat/mlflow-enterprise-patterns

Create a wrapper chart for CloudnativePG that includes support bundle specs, following the patterns/support-bundles pattern.

Scope

• Create applications/mlflow/charts/postgres-support/Chart.yaml (wrapper chart, no application code)
• Create applications/mlflow/charts/postgres-support/templates/_supportbundle.tpl with:
  • CloudnativePG operator pod logs collector
  • PostgreSQL cluster status collector
  • PVC status collector
  • Analyzer for common PostgreSQL failure modes
• Create applications/mlflow/charts/postgres-support/templates/secret-supportbundle.yaml (support bundle spec as Secret)
• Add the wrapper chart as a dependency in applications/mlflow/charts/mlflow/Chart.yaml or as a separate HelmChart CR in release/
• Update release/kots-support-bundle.yaml if needed to reference wrapper chart specs

Files touched

• applications/mlflow/charts/postgres-support/ (new directory, all new files)
• applications/mlflow/release/kots-support-bundle.yaml (potential update)

PR target

Branch PRs to feat/mlflow-enterprise-patterns (not main).