azurerm_firewall_policy_rule_collection_group - limit dnat rule destination port max number to 1

[wuxu92]

Fixes: #18725

I have reproduced this bug locally, looks like a server-side limitation on this parameter. the detailed error message is below. so I simply add a MaxItem limit to it so it is exposed in the terraform plan stage. This looks like breaking change, Or should we only update the document but not add the MaxItems limit in the code?

{
    "error": {
        "code": "FirewallPolicyNatRuleInvalidDnatMultipleDestinationPortsExists",
        "message": "Firewall Policy Nat Rule Collection: nat_rule_collection1 Rule: nat_rule_collection1_rule1 has Multiple Destination Ports on a DNAT Rule. This is not supported, please set only 1 destination port on this rule."
    },
    "status": "Failed"
}

cc @neil-yechenwei if you know more context about this feature? I found you have worked on this before, Thanks.

[stephybun]

Thanks @wuxu92 LGTM 🐞

[github-actions]

This functionality has been released in v3.28.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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