azurerm_virtual_network_gateway - fix crash issue when specifying root_certificate or revoked_certificate

[sinbai]

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Description

Properties root_certificate and root_certificate are TypeSet, which should be converted to (*pluginsdk.Set).List() instead of ([]interface{}).

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

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Testing

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Test result:
PASS: TestAccVirtualNetworkGateway_vpnClientConfig (2859.91s)

Change Log

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

• azurerm_virtual_network_gateway - fix crash issue when specifying root_certificate or revoked_certificate [Virtual Network Gateway (VPN) regression starting in AzureRM 4.10.0 #28097]

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 #28097

Note

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

[jackofallops]

Thanks @sinbai - LGTM 👍