[TestCase] Fix acctest for CostManagement

[neil-yechenwei]

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Description

Recently test cases related with CostManagement are failed on Teamcity Daily Run. After checked, I found that now TF would check if there is replacement while updating resource in the test case. So I submitted this PR to not change the forcenew property.

PR Checklist

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Change Log

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• [TestCase] Fix acctest for CostManagement

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Note

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[katbyte]

LGTM 🌵