Support uninstallation on intra-dependency

[Daniel-Fan]

uninstallation issue: https://github.ibm.com/IBMPrivateCloud/roadmap/issues/62243

Context

There are several services depending on the same operator, but different operands.

For example, both IM service and Keycloak service depend on the same EDB operator. However, each of them has different EDB Cluster CR. As a result, we are using different entires in OperandRegistry/OperandConfig to distinguish EDB used by IM as common-service-postgresql, and EDB used by Keycloak as edb-keycloak

For simplicity, I will only use EDB Cluster CR as the operand created by ODLM.

• If we request common-service-postgresql, it will install EDB operator, and EDB Cluster CR common-service-db.
• If we request edb-keycloak, it will install EDB operator, and EDB Cluster CR keycloak-edb-cluster.

When we request both of them in the OperandRequest, they share the same EDB operator, but different EDB Cluster CRs.

During the uninstallation, following pattern should be fulfilled.

• EDB operator would be uninstalled only when there is no common-service-postgresql and edb-keycloak requested
• common-service-db Cluster CR should be removed as long as there is no common-service-postgresql in OperandRequest
• keycloak-edb-cluster Cluster CR should be removed as long as there is no edb-keycloak in OperandRequest

How to test

• Install CS 4.6 daily build in one namespace
• Update ODLM CSV to replace image to quay.io/opencloudio/odlm:9c23dfda, and update ImagePullPolicy to Always
• Create an OperandRequest to request both common-service-postgresql and edb-keycloak

  kind: OperandRequest
  apiVersion: operator.ibm.com/v1alpha1
  metadata:
    name: example-service
  spec:
    requests:
      - operands:
          - name: common-service-postgresql
          - name: edb-keycloak
        registry: common-service

• Observe that there are common-service-db-1 and keycloak-edb-cluster-1 pods available, representing two EDB Cluster CR respectively.
• Observe that there is a postgresql-operator-controller-manager pod available, representing EDB operator
• Update OperandRequest, to remove common-service-postgresql
• Observe that there is NO common-service-db-1 pod in the namespace.
• Observe that there is still keycloak-edb-cluster-1 and postgresql-operator-controller-manager pod in the namespace.
• Delete the entire OperandRequest
• Observe that there is no more EDB related pod left in the namespace.

[Daniel-Fan]

/retest

[YCShen1010]

/lgtm

[ibm-ci-bot]

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