[Bug] Domain name cannot be null while creating DBCS via DBSystems-VM-BM sheet

[kudipudirk]

Bug Description

Getting error "400-InvalidParameter, Domain name cannot be null"
while creating DB System (DBCS) using CD3 toolkit via Jenkins.

Root Cause

The DBSystems-VM-BM Excel sheet does not have a "domain" column.
CD3 generates the .auto.tfvars without the domain parameter,
but the OCI Terraform provider now requires domain as a mandatory
field for LaunchDbSystem API.

Steps to Reproduce

1. Fill DBSystems-VM-BM sheet in CD3 Excel template
2. Run CD3 toolkit with "Create Resources" workflow for Database
3. Run Terraform apply via Jenkins
4. Error: 400-InvalidParameter, Domain name cannot be null

Expected Behavior

CD3 should include "domain" column in DBSystems-VM-BM sheet and
generate domain parameter in the .auto.tfvars file automatically
using subnet DNS label + VCN DNS label.

Environment

• CD3 Toolkit Version: (మీ version రాయండి)
• OCI Terraform Provider Version: 7.19.x
• Workflow: Jenkins

Error Message

Error: 400-InvalidParameter, Domain name cannot be null.
Provider version: 7.19.x