chore: remove migration script

[Aashiq-J]

Description

We had decided to keep the migration only for one release. Hence removing it now, so that for the next release of the landing zone wont have the scripts.

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[Aashiq-J]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 7.0.0 🎉

The release is available on:

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• v7.0.0

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