All allowed regions for activity tracker are not updated

[nupurg-ibm]

Description

All allowed regions for activity tracker are not updated

https://github.com/terraform-ibm-modules/terraform-ibm-landing-zone/blob/main/atracker.tf#L8 Here the list is not updated with all the allowed regions for atracker which IBM cloud supports today

New or affected modules

landing-zone

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[ocofaigh]

PR: #1005