Flip `enable_platform_metrics` to false by default and remove virtual input workaround

[iamar7]

Description

https://github.com/terraform-ibm-modules/terraform-ibm-landing-zone-vpc/blob/main/ibm_catalog.json

New or affected modules

terraform-ibm-landing-zone-vpc

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[terraform-ibm-modules-ops]

🎉 This issue has been resolved in version 7.25.15 🎉

The release is available on:

• GitHub release
• v7.25.15

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