fix: upgrade test requires fully-configurable folder

[shemau]

Description

Fixes for recent test failure during renovate PR pipelines

1. Upgrade test to include fully configurable
2. Remove existing_backup_kms_key_crn which results in duplicate auth key

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[shemau]

/run pipeline

[shemau]

Failing with duplicate auth policy. Re-trying whilst investigating.

[shemau]

/run pipeline

[shemau]

The issue is two identical policies based on a shared key:

2025/07/02 10:37:45 Terraform apply | # module.mysql.module.mysql[0].ibm_iam_authorization_policy.backup_kms_policy[0] will be created

2025/07/02 10:37:45 Terraform apply | # module.mysql.module.mysql[0].ibm_iam_authorization_policy.kms_policy[0] will be created

[shemau]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 2.0.1 🎉

The release is available on:

• GitHub release
• v2.0.1

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