azurerm_virtual_network_gateway - changing ip_configuration forces new

[ziyeqf]

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Description

The service error when overwrite or removing existing ip_configuration (reported #27756), and also, each type gateway requires an exact number of ip_configuration, no new one can be added, so changing it forces new.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
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Changes to existing Resource / Data Source

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Testing

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This PR is small and the test cases are failing for other reasons which I believe shall be fixed in another PR.

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_virtual_network_gateway - force new when ip_configuration overwrite or removing existing ones [GH-00000]

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 #27756

Note

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

[stephybun]

Thanks @ziyeqf LGTM 👍

[github-actions]

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