SPL-290980: create the KVService CR in existing spluk CRs

[jmsplunk]

Description

• Create the KVService CR in existing splunk CRs if not there
• Update the ownerReference if the KVService CR already exists
• Delete the KVService CR when the last owner gets deleted

Key Changes

• Add the KVService CR creation/deletion logic in util.go
• Use the defined functions in every existing v4 CRs
• Add unit tests in util_test.go

Testing and Verification

# Step 1: Create Standalone. Check KVService CR and ownerreference
# Step 2: Create LicenseManager. Check KVService CR and ownerreference
# Step 3: Delete Standalone CR - KVService Remains and ownerreference should only contains license manager
# Step 4: Delete LicenseManager CR - KVService Deleted

Step1
root@ip-10-236-5-61:~/splunk-operator# kubectl apply -n splunk-operator -f - <<EOF
apiVersion: enterprise.splunk.com/v4
kind: Standalone
metadata:
  name: test-kvstore
spec:
  replicas: 1
EOF
standalone.enterprise.splunk.com/test-kvstore created
  
 root@ip-10-236-5-61:~/splunk-operator# kubectl get kvservice splunk-splunk-operator-kvservice -n splunk-operator -o jsonpath='{.metadata.ownerReferences[*].kind}'
Standalone

Step2
root@ip-10-236-5-61:~/splunk-operator# kubectl apply -n splunk-operator -f - <<EOF-f - <<EOF
apiVersion: enterprise.splunk.com/v4
kind: LicenseManager
metadata:
  name: test-lm
spec: {}
EOF
licensemanager.enterprise.splunk.com/test-lm created

 root@ip-10-236-5-61:~/splunk-operator# kubectl get kvservice splunk-splunk-operator-kvservice -n splunk-operator -o jsonpath='{.metadata.ownerReferences[*].kind}'
Standalone LicenseManager

Step 3
root@ip-10-236kubectl delete standalone test-kvstore -n splunk-operatorvstore -n splunk-operator
standalone.enterprise.splunk.com "test-kvstore" deleted from splunk-operator namespace
  
root@ip-10-236-5-61:~/splunk-operator# kubectl get kvservice splunk-splunk-operator-kvservice -n splunk-operator -o jsonpath='{.metadata.ownerReferences[*].kind}'
LicenseManager

Step4 
root@ip-10-236-5-61:~/splkubectl delete licensemanager test-lm -n splunk-operatorplunk-operator
licensemanager.enterprise.splunk.com "test-lm" deleted from splunk-operator namespace
root@ip-10-236-5-61:~/splunk-operator# kubectl get kvservice -n splunk-operator
No resources found in splunk-operator namespace.

Related Issues

Jira tickets, GitHub issues, Support tickets...

PR Checklist

• Code changes adhere to the project's coding standards.
• Relevant unit and integration tests are included.
• Documentation has been updated accordingly.
• All tests pass locally.
• The PR description follows the project's guidelines.