feat: add support to use an optional prefix in the COS instances DA

[ocofaigh]

Description

add support to use an optional prefix in the COS instances DA

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[ocofaigh]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 8.5.0 🎉

The release is available on:

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• v8.5.0

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