New-AzPolicyAssignment - Version references have the form '{major}.{minor|*}[.*][-preview]'

### Description

Policy definition format of 1.0.0 is not recognized as a valid version when trying to assign the policy with an explicit version.

Policy Definition
`{
"properties": {
"displayName": "GuardRails cannot delete lock to specific resources",
"policyType": "Custom",
"mode": "Indexed",
"description": "With this policy: any resource that has the tag key LockLevel with the value CanNotDelete means authorized users can read and modify the resource, but they can not delete it.",
"metadata": {
"category": "GuardRails",
"createdBy": "7cd95a03-6c7e-44fc-b1c1-27b220e89d60",
"createdOn": "2025-05-23T04:43:38.0173451Z",
"updatedBy": "7cd95a03-6c7e-44fc-b1c1-27b220e89d60",
"updatedOn": "2025-05-23T04:56:03.5125828Z"
},
"version": "1.0.0",
"parameters": {
"tagValue": {
"type": "string",
"metadata": {
"displayName": "Exclusion Tag Value",
"description": "Value of the tag to use for excluding resources from this policy. This should be used along with the Exclusion Tag Name parameter."
},
"defaultValue": "exclude"
},
"effect": {
"type": "String",
"metadata": {
"displayName": "Effect",
"description": "DeployIfNotExists, AuditIfNotExists or Disabled the execution of the Policy"
},
"allowedValues": [
"DeployIfNotExists",
"AuditIfNotExists",
"Disabled"
],
"defaultValue": "DeployIfNotExists"
},
"tagName": {
"type": "string",
"metadata": {
"displayName": "Exclusion Tag Name",
"description": "Name of the tag to use for excluding resources from this policy. This should be used along with the Exclusion Tag Value parameter."
},
"defaultValue": "GuardRailsPolicyExclusion"
}
},
"policyRule": {
"then": {
"effect": "[parameters('effect')]",
"details": {
"deployment": {
"properties": {
"template": {
"parameters": {
"resourceType": {
"type": "string"
},
"resourceName": {
"type": "string"
}
},
"resources": [
{
"scope": "[concat(parameters('resourceType'),'/', parameters('resourceName'))]",
"properties": {
"level": "CanNotDelete",
"notes": "Locked by Azure Policy"
},
"name": "ResourceLockedByPolicy",
"apiVersion": "2016-09-01",
"type": "Microsoft.Authorization/locks"
}
],
"outputs": {},
"contentVersion": "1.0.0.0",
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"variables": {}
},
"parameters": {
"resourceType": {
"value": "[field('type')]"
},
"resourceName": {
"value": "[field('name')]"
}
},
"mode": "incremental"
}
},
"existenceCondition": {
"allOf": [
{
"In": [
"CanNotDelete"
],
"field": "Microsoft.Authorization/locks/level"
},
{
"equals": "Locked by Azure Policy",
"field": "Microsoft.Authorization/locks/notes"
}
]
},
"name": "ResourceLockedByPolicy",
"roleDefinitionIds": [
"/providers/microsoft.authorization/roleDefinitions/8e3af657-a8ff-443c-a75c-2fe8c4bcb635"
],
"type": "Microsoft.Authorization/locks"
}
},
"if": {
"allOf": [
{
"equals": "CanNotDelete",
"field": "tags.LockLevel"
},
{
"equals": 2,
"value": "[length(split(field('type'),'/'))]"
},
{
"not": {
"equals": "[parameters('tagValue')]",
"field": "[concat('tags[',parameters('tagName'), ']')]"
}
}
]
}
},
"versions": [
"1.0.0"
]
},
"id": "/subscriptions/2b588cd5-c197-48e2-b2d8-8facc009833b/providers/Microsoft.Authorization/policyDefinitions/GuardRails-CanNotDeleteLock",
"type": "Microsoft.Authorization/policyDefinitions",
"name": "GuardRails-CanNotDeleteLock",
"systemData": {
"createdBy": "romikov@gmail.com",
"createdByType": "User",
"createdAt": "2025-05-23T04:43:37.9909707Z",
"lastModifiedBy": "romikov@gmail.com",
"lastModifiedByType": "User",
"lastModifiedAt": "2025-05-23T04:56:03.4774832Z"
}
}`

### Issue script & Debug output

```PowerShell
`New-AzPolicyDefinition -Name $policyBaseName -DisplayName $policyDisplayName -Policy $policyDefinitionPath -SubscriptionId $subscriptionId -Metadata $metadata -ErrorAction Stop
$policy = Get-AzPolicyDefinition -Name $policyBaseName -ErrorAction Stop

New-AzPolicyAssignment -Name $policyBaseName -DisplayName $policyDisplayName -Scope $scope -PolicyDefinition $policy -IdentityType "SystemAssigned" -Location "australiaeast" -DefinitionVersion $policyVersion -ErrorAction Stop`

`New-AzPolicyAssignment_CreateExpanded : The policy resource 'GuardRails-CanNotDeleteLock' has invalid properties. The following
definition version references are not valid: '1.0.0'. Version references have the form '{major}.{minor|*}[.*][-preview]' where each
segment is a number without leading zeros or an asterisk. The major version number must be greater than zero.
At D:\Romiko\Documents\WindowsPowerShell\Modules\Az.Resources\8.0.0\Policy.Autorest\custom\New-AzPolicyAssignment.ps1:435 char:19
+ $scriptCmd = {& $wrappedCmd @calledParameters}
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: ({ }:<>f__AnonymousType1) [New-AzPolicyAssignment_CreateExpanded], Exception
+ FullyQualifiedErrorId : InvalidCreatePolicyAssignmentRequest,Microsoft.Azure.PowerShell.Cmdlets.Policy.Cmdlets.NewAzPolicyAss
ignment_CreateExpanded`
```

### Environment data

```PowerShell
Name Value
---- -----
PSVersion 5.1.26100.4061
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.26100.4061
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
```

### Module versions

```PowerShell
ModuleType Version Name ExportedCommands
---------- ------- ---- ----------------
Script 5.0.0 Az.Accounts {Add-AzEnvironment, Clear-AzConfig, Clear-AzContext, Clear-AzDefault...}
Script 1.7.1 Az.PolicyInsights {Get-AzPolicyAttestation, Get-AzPolicyEvent, Get-AzPolicyMetadata, Get-...
Script 8.0.0 Az.Resources {Export-AzResourceGroup, Export-AzTemplateSpec, Get-AzDenyAssignment, G...
```

### Error output

```PowerShell

```

Reproduce the failure with New-AzPolicyAssignment and inspect Az.Resources 8.0.0, especially Policy.Autorest/custom/New-AzPolicyAssignment.ps1 around line 435. Trace how DefinitionVersion is validated against the policy's 1.0.0 version reference, then verify that the documented policy assignment scenario completes without the invalid-version error.

Written by the indexing model from the issue text.