feat: change default OS in DA to RHCOS

[vkuma17]

Description

change default OS in DA to RHCOS

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[vkuma17]

/run pipeline

[vkuma17]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 3.55.5 🎉

The release is available on:

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• v3.55.5

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