fix: give en_source_name a default value

[ocofaigh]

Description

see details in terraform-ibm-modules/terraform-ibm-scc#201

The upgrade test was skipped (low risk) as it would of failed with: terraform-ibm-modules/terraform-ibm-scc#201 (comment)

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[ocofaigh]

/run pipeline

[ocofaigh]

Going to wait for new SCC module version terraform-ibm-modules/terraform-ibm-scc#201

[ocofaigh]

/run pipeline

[ocofaigh]

/run pipeline

[ocofaigh]

The two instances tests passed:
--- PASS: TestRunExistingResourcesInstances
--- PASS: TestInstancesInSchematics

Proceeding with merge

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.24.1 🎉

The release is available on:

• GitHub release
• v1.24.1

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