tests: unused cmd line var set

[jor2]

Description

fix test failure

TestRunFSCloudExample 2025-01-30T06:13:37Z logger.go:67: │ Error: Value for undeclared variable
TestRunFSCloudExample 2025-01-30T06:13:37Z logger.go:67: │ 
TestRunFSCloudExample 2025-01-30T06:13:37Z logger.go:67: │ A variable named "existing_kms_instance_guid" was assigned on the command
TestRunFSCloudExample 2025-01-30T06:13:37Z logger.go:67: │ line, but the root module does not declare a variable of that name. To use
TestRunFSCloudExample 2025-01-30T06:13:37Z logger.go:67: │ this value, add a "variable" block to the configuration.
TestRunFSCloudExample 2025-01-30T06:13:37Z logger.go:67: ╵
TestRunFSCloudExample 2025-01-30T06:13:37Z retry.go:99: Returning due to fatal error: FatalError{Underlying: error while running command: exit status 1; ╷

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[jor2]

/run pipeline

[shemau]

LGTM

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.15.7 🎉

The release is available on:

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• v1.15.7

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