Disable-AzAksAddon to remove monitoring addon returns error "code":"BadRequest","message":"The request format was unexpected, a non-UserAssigned identity type should not contain: userAssignedIdentities"

### Description

Cmdlet reference shows an example for removing monitoring addon from AKS cluster.
https://docs.microsoft.com/ja-jp/powershell/module/az.aks/disable-azaksaddon?view=azps-7.4.0

However, running below cmdlet returns error.
Get-AzAksCluster -ResourceGroupName group -Name myCluster | Disable-AzAksAddon -Name Monitoring

"code":"BadRequest","message":"The request format was u nexpected, a non-UserAssigned identity type should not contain: userAssignedIdentities"

Repro steps:
1. Deploy an AKS cluster from Azure portal with monitoring settings enabled.
2. Run above command. Command fails with an error. (Repro)

Azure CLI works fine to remove monitoring addon for the same cluster.
az aks disable-addons -a monitoring -n myCluster -g group

### Issue script & Debug output

```PowerShell
PS C:\WINDOWS\system32> Get-AzAksCluster -ResourceGroupName AKSTestRG -Name AKSTest2 | Disable-AzAksAddon -Name Monitoring -verbose -debug
警告: Upcoming breaking changes in the cmdlet 'Get-AzAksCluster' :
Get-AzAks will be removed in the next major release. Please use Get-AzAksCluster instead of Get-AzAks

Debug: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://management.azure.com/subscriptions/*****/resourceGroups/AKSTestRG/providers/Microsoft.ContainerService/managedClusters/AKSTest2?api-version=2021-05-01

Headers:
x-ms-client-request-id : 9b96a256-b393-4fb6-9023-01f7a244af04
accept-language : en-US

Body:

Debug: ============================ HTTP RESPONSE ============================

Status Code:
OK

Headers:
Pragma : no-cache
x-ms-routing-request-id : JAPANEAST:20220421T082742Z:816e9a11-0118-44c9-af7c-89dee03f3223
x-ms-ratelimit-remaining-subscription-reads: 11998
x-ms-correlation-request-id : 816e9a11-0118-44c9-af7c-89dee03f3223
x-ms-request-id : 6bd6086d-7ecd-4db9-9f4c-0437c0d311b8
Strict-Transport-Security : max-age=31536000; includeSubDomains
X-Content-Type-Options : nosniff
Cache-Control : no-cache
Date : Thu, 21 Apr 2022 08:27:41 GMT
Server : nginx

Body:
{
"id": "/subscriptions/*****/resourcegroups/AKSTestRG/providers/Microsoft.ContainerService/managedClusters/AKSTest2",
"location": "westus2",
"name": "AKSTest2",
"type": "Microsoft.ContainerService/ManagedClusters",
"properties": {
"provisioningState": "Succeeded",
"powerState": {
"code": "Running"
},
"kubernetesVersion": "1.22.6",
"dnsPrefix": "AKSTest2-dns",
"fqdn": "*****.azmk8s.io",
"azurePortalFQDN": "*****.azmk8s.io",
"agentPoolProfiles": [
{
"name": "agentpool",
"count": 3,
"vmSize": "Standard_B4ms",
"osDiskSizeGB": 128,
"osDiskType": "Managed",
"kubeletDiskType": "OS",
"maxPods": 110,
"type": "VirtualMachineScaleSets",
"enableAutoScaling": false,
"provisioningState": "Succeeded",
"powerState": {
"code": "Running"
},
"orchestratorVersion": "1.22.6",
"enableNodePublicIP": false,
"mode": "System",
"osType": "Linux",
"osSKU": "Ubuntu",
"nodeImageVersion": "AKSUbuntu-1804gen2containerd-2022.04.05",
"enableFIPS": false
}
],
"servicePrincipalProfile": {
"clientId": "msi"
},
"addonProfiles": {
"azureKeyvaultSecretsProvider": {
"enabled": false,
"config": null
},
"azurepolicy": {
"enabled": false,
"config": null
},
"httpApplicationRouting": {
"enabled": false,
"config": null
},
"omsagent": {
"enabled": true,
"config": {
"logAnalyticsWorkspaceResourceID": "/subscriptions/*****/resourcegroups/defaultresourcegroup-wus2/providers/microsoft.operationalinsights/workspaces/defaultworkspace-*****-wus2"
},
"identity": {
"resourceId": "/subscriptions/*****/resourcegroups/MC_AKSTestRG_AKSTest2_westus2/providers/Microsoft.ManagedIdentity/userAssignedIdentities/omsagent-akstest2",
"clientId": "f4c49a05-5cf4-47f4-9830-0461a35b2e8f",
"objectId": "5dea28bd-e1ab-4fda-914b-300d808d6c89"
}
}
},
"nodeResourceGroup": "MC_AKSTestRG_AKSTest2_westus2",
"enableRBAC": true,
"networkProfile": {
"networkPlugin": "kubenet",
"loadBalancerSku": "Standard",
"loadBalancerProfile": {
"managedOutboundIPs": {
"count": 1
},
"effectiveOutboundIPs": [
{
"id": "/subscriptions/*****/resourceGroups/MC_AKSTestRG_AKSTest2_westus2/providers/Microsoft.Network/publicIPAddresses/f3a597cf-9c49-4429-bdd1-f30303035207"
}
]
},
"podCidr": "10.244.0.0/16",
"serviceCidr": "10.0.0.0/16",
"dnsServiceIP": "10.0.0.10",
"dockerBridgeCidr": "172.17.0.1/16",
"outboundType": "loadBalancer"
},
"maxAgentPools": 100,
"apiServerAccessProfile": {
"enablePrivateCluster": false
},
"identityProfile": {
"kubeletidentity": {
"resourceId": "/subscriptions/*****/resourcegroups/MC_AKSTestRG_AKSTest2_westus2/providers/Microsoft.ManagedIdentity/userAssignedIdentities/AKSTest2-agentpool",
"clientId": "37d7fed1-cebb-4a3b-9cbf-ebc1f2bc868a",
"objectId": "9c7dc8ee-dc79-436b-8507-0c40974c5a7a"
}
}
},
"identity": {
"type": "SystemAssigned",
"principalId": "**********",
"tenantId": "*********"
},
"sku": {
"name": "Basic",
"tier": "Free"
}
}

Debug: ============================ HTTP REQUEST ============================

HTTP Method:
PUT

Absolute Uri:
https://management.azure.com/subscriptions/*****/resourceGroups/AKSTestRG/providers/Microsoft.ContainerService/managedClusters/AKSTest2?api-version=2021-05-01

Headers:
x-ms-client-request-id : 9b96a256-b393-4fb6-9023-01f7a244af04
accept-language : en-US

Body:
{
"properties": {
"kubernetesVersion": "1.22.6",
"dnsPrefix": "AKSTest2-dns",
"addonProfiles": {
"azureKeyvaultSecretsProvider": {
"enabled": false,
"config": {}
},
"azurepolicy": {
"enabled": false,
"config": {}
},
"httpApplicationRouting": {
"enabled": false,
"config": {}
},
"omsagent": {
"enabled": false
}
},
"nodeResourceGroup": "MC_AKSTestRG_AKSTest2_westus2",
"enableRBAC": true,
"networkProfile": {
"networkPlugin": "kubenet",
"podCidr": "10.244.0.0/16",
"serviceCidr": "10.0.0.0/16",
"dnsServiceIP": "10.0.0.10",
"dockerBridgeCidr": "172.17.0.1/16",
"loadBalancerSku": "Standard",
"loadBalancerProfile": {
"managedOutboundIPs": {
"count": 1
},
"effectiveOutboundIPs": [
{
"id": "/subscriptions/*****/resourceGroups/MC_AKSTestRG_AKSTest2_westus2/providers/Microsoft.Network/publicIPAddresses/f3a597cf-9c49-4429-bdd1-f30303035207"
}
]
}
},
"apiServerAccessProfile": {
"authorizedIPRanges": [],
"enablePrivateCluster": false
},
"identityProfile": {
"kubeletidentity": {
"resourceId": "/subscriptions/*****/resourcegroups/MC_AKSTestRG_AKSTest2_westus2/providers/Microsoft.ManagedIdentity/userAssignedIdentities/AKSTest2-agentpool",
"clientId": "37d7fed1-cebb-4a3b-9cbf-ebc1f2bc868a",
"objectId": "9c7dc8ee-dc79-436b-8507-0c40974c5a7a"
}
},
"privateLinkResources": []
},
"identity": {
"type": "SystemAssigned",
"userAssignedIdentities": {}
},
"location": "westus2",
"tags": {}
}

Debug: ============================ HTTP RESPONSE ============================

Status Code:
BadRequest

Headers:
Pragma : no-cache
x-ms-failure-cause : gateway
x-ms-request-id : 04d46c3a-775d-46d0-9879-06e518779f9e
x-ms-correlation-request-id : 04d46c3a-775d-46d0-9879-06e518779f9e
x-ms-routing-request-id : JAPANEAST:20220421T082746Z:04d46c3a-775d-46d0-9879-06e518779f9e
Strict-Transport-Security : max-age=31536000; includeSubDomains
X-Content-Type-Options : nosniff
Cache-Control : no-cache
Date : Thu, 21 Apr 2022 08:27:45 GMT

Body:
{
"error": {
"code": "FailedIdentityOperation",
"message": "Identity operation for resource '/subscriptions/*****/resourceGroups/AKSTestRG/providers/Microsoft.ContainerService/managedClusters/AKSTest2' failed with error 'Failed to perform resource identity operation. Status:
'BadRequest'. Response: '{\"error\":{\"code\":\"BadRequest\",\"message\":\"The request format was unexpected, a non-UserAssigned identity type should not contain: userAssignedIdentities\"}}'.'."
}
}

Identity operation for resource '/subscriptions/*****/resourceGroups/AKSTestRG/providers/Microsoft.ContainerService/managedClusters/AKSTest2' failed with error 'Failed to perform resource identity operation. Status: 'BadRequest'. Response:
'{"error":{"code":"BadRequest","message":"The request format was unexpected, a non-UserAssigned identity type should not contain: userAssignedIdentities"}}'.'.
```

### Environment data

```PowerShell
Name Value
---- -----
PSVersion 5.1.22000.613
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.22000.613
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
```

### Module versions

```PowerShell
ModuleType Version Name ExportedCommands
---------- ------- ---- ----------------
Script 2.7.5 Az.Accounts {Add-AzEnvironment, Clear-AzContext, Clear-AzDefault, Connect-AzAccount...}
Script 3.1.2 Az.Aks {Disable-AzAksAddOn, Enable-AzAksAddOn, Get-AzAksCluster, Get-AzAksNodePool...}
```

### Error output

```PowerShell
Resolve-AzError
WARNING: Upcoming breaking changes in the cmdlet 'Resolve-AzError' :
The `Resolve-Error` alias will be removed in a future release. Please change any scripts that use this alias to use `Resolve-AzError` instead.
Note : Go to https://aka.ms/azps-changewarnings for steps to suppress this breaking change warning, and other information on breaking changes in Azure PowerShell.
Resolve-AzError: Input string was not in a correct format.
```