Bigtable: Check ForceNew for kms_key_name field in the diff function

[modular-magician]

ForceNew property for kms_key_name needs to be checked in resourceBigtableInstanceClusterReorderTypeList() similar to zone and storage_type. Otherwise, we may not be comparing the same cluster based on the index only.

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bigtable: update checking ForceNew logic for `kms_key_name`

Derived from GoogleCloudPlatform/magic-modules#6765

[github-actions]

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