`r/aws_networkmanager_core_network`: Remove deprecated `base_policy_region` attribute

[jar-b]

Description

Issue for tracking the removal of the deprecated base_policy_region attribute in the v6.0.0 provider release.

https://github.com/hashicorp/terraform-provider-aws/blob/d6c8a4d9eede1f528043a09b9eb67122d778f121/internal/service/networkmanager/core_network.go#L61-L68

References

Relates #29623

Would you like to implement a fix?

None

[github-actions[bot]]

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[aayushsss1]

Hey I can take this up!