azurerm_virtual_network_dns_servers: move vnet locker before GET virtual network

[wuxu92]

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Description

The locker should place before get virtual network, or the create/update/delete will PUT the virtual network with outdated data, which causes subnets be created unexpectly.

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Change Log

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• azurerm_virtual_network_dns_servers - move vnet locker before get virtual network.

This is a (please select all that apply):

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

Related Issue(s)

Fixes #26980

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[stephybun]

Thanks @wuxu92 LGTM 👍

[github-actions]

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