Enable StorageClass configuration for common-service-db

[YCShen1010]

Issue:https://github.ibm.com/IBMPrivateCloud/roadmap/issues/62395

Context

Added a storageClass template for common-service-db, so that when the user configures the storageClass in the CommonService CR, the custom storageClass will be added to the common-service-db resource in OperandConfig and synchronized in the Cluster CR.

How to test

test image: quay.io/yuchen_shen/cs_operator:csdb_sc

1. Request common-service-postgresql without configure storageClass in CommonService CR, there will be no storageClass section for common-service-db in Cluster CR
2. Apply the test image, configure a storageClass in CS CR
3. Delete common-service OpCon and common-service-db Cluster CR and restart ODLM pod
4. Observe the custom sc will be added in OperandConfig and existing common-service-db Cluster CR

example:

storage:
    resizeInUseVolumes: true
    size: 1Gi
    storageClass: <storage-class-name>

[Daniel-Fan]

/lgtm

[ibm-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Daniel-Fan, YCShen1010

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