Operator is deployment-ready and reconciles changes properly

[tumido]

Goal

Bring the operator to a releasable, usable state where it offers a comparable stable experience as installing via helm chart.

Acceptance criteria

• Operator is able to deploy Backstage
• Operator can reconcile changes
• Operator can enforce Janus IDP image
• Operator can enforce proper routing

Requirements

• Test plan
• Documentation

Issues in Epic

• Override used values for deployed image #17
• Provide values override for global.clusterRouterBase #4
• Fix operator reconcile loop - pass existing PostgreSQL credentals #5
• Reconciliation initiated without a valid cause #10
• Operator doesn't ignore Helm tests on deployment/reconcile #20

Notes

Additional context
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