The "Status" property of "PSTriggerRun" from Get-AzSynapseTriggerRun shows type "Microsoft.Azure.Commands.Synapse.Models.PSTriggerRunStatus" instead of value

### Description

I wanted to check the status of my synapse trigger run using cmdlet "Get-AzSynapseTriggerRun" from "Az.Synapse", but the "Status" property shows the type of the property instead of the real value "Microsoft.Azure.Commands.Synapse.Models.PSTriggerRunStatus"
Azure CLI is working correctly.

### Issue script & Debug output

```PowerShell
Select-AzSubscription -SubscriptionId "xx"
$rgName = "rg-yy"
$wsName = "synapseworkspace"
$trigName = "Trigger"

$today = Get-Date
$yesterday = $today.AddDays(-1)

$ws = Get-AzSynapseWorkspace -Name $wsName -ResourceGroupName $rgName
$trigRun = $ws | Get-AzSynapseTriggerRun -Name $trigName -RunStartedAfter $yesterday -RunStartedBefore $today

$trigRun.Status
# It returns => Microsoft.Azure.Commands.Synapse.Models.PSTriggerRunStatus
# With zz cli
az synapse trigger-run query-by-workspace --workspace-name $wsName --filters operand="TriggerName" operator="Equals" values="$($trigName)" --last-updated-after $yesterday.ToString("o") --last-updated-before $today.ToString("o") --query "value[0].status"
# we get "Succeeded"
```

### Environment data

```PowerShell
$PSVersionTable

Name Value
---- -----
PSVersion 7.4.2
PSEdition Core
GitCommitId 7.4.2
OS Microsoft Windows 10.0.19045
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
```

### Module versions

```PowerShell
Get-Module Az*

ModuleType Version PreRelease Name ExportedCommands
---------- ------- ---------- ---- ----------------
Script 3.0.0 Az.Accounts {Add-AzEnvironment, Clear-AzConfig, Clear-AzContext, Clear-AzDefau…
Script 3.0.8 Az.Synapse {Add-AzSynapseDataFlowDebugSessionPackage, Add-AzSynapseTriggerSub…
```

### Error output

_No response_

Start by reproducing the issue with Get-AzSynapseTriggerRun and inspect the Status property returned by the Az.Synapse module, particularly PSTriggerRunStatus. Compare it with the Azure CLI query shown in the report; done means the PowerShell property exposes the actual status value such as Succeeded rather than the type name.

Written by the indexing model from the issue text.