chore: update existing_resource_group_name variable format and catalog entries

[piyush117]

Description

issue : https://github.ibm.com/GoldenEye/issues/issues/15895

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Release notes content

Start to consume catalog feature that supports picking default resource group. The catalog team have added logic to the resource group picker so that if user selects "Default" from the dropdown, even if it is not named "Default", the picker will pass the actual name of the default resource group in the account to Schematics.

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[piyush117]

/run pipeline

[shemau]

/run pipeline

[shemau]

LGTM. Implements what the issue requests.

[terraform-ibm-modules-ops]

🎉 This PR is included in version 4.2.13 🎉

The release is available on:

• GitHub release
• v4.2.13

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