Get-AzWebAppSnapshot and Restore-AzWebAppSnapshot fail when `-UseDisasterRecovery` is passed.

### Description

Passing `-UseDisasterRecovery` causes InternalServerError (The remote name could not be resolved: 'waws-prod-bn1-013dr.api.azurewebsites.windows.net')

This issue is also noted in the ScenarioTests:
https://github.com/Azure/azure-powershell/blob/3d831ac6827ded389166060fc67e1b40930f66ad/src/Websites/Websites.Test/ScenarioTests/WebAppBackupRestoreTests.ps1#L356C12-L356C32

### Issue script & Debug output

```powershell
$snapshot = (Get-AzWebAppSnapshot -Name $SourceName -ResourceGroupName $SourceResourceGroupName -UseDisasterRecovery -Debug)[0]

DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://management.azure.com/subscriptions/[redacted]/resourceGroups/[redacted]/providers/Microsoft.Web/sites/[redacted]/snapshotsdr?api-version=2021-01-15

Headers:
x-ms-client-request-id : ffd7df45-405c-49f2-a736-ba626bf83f65
Accept-Language : en-US

Body:

DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
InternalServerError

Headers:
Cache-Control : no-cache
Pragma : no-cache
Strict-Transport-Security : max-age=31536000; includeSubDomains
X-AspNet-Version : 4.0.30319
X-Powered-By : ASP.NET
x-ms-failure-cause : service
x-ms-ratelimit-remaining-subscription-reads: 249
x-ms-ratelimit-remaining-subscription-global-reads: 3749
x-ms-request-id : e659fbe0-a538-4d01-9959-2f993ceb6cb6
x-ms-correlation-request-id : e659fbe0-a538-4d01-9959-2f993ceb6cb6
x-ms-routing-request-id : EASTUS:20241010T184426Z:e659fbe0-a538-4d01-9959-2f993ceb6cb6
X-Content-Type-Options : nosniff
X-Cache : CONFIG_NOCACHE
X-MSEdge-Ref : Ref A: FCBA7D33FCA746E487E6D4567DAD0586 Ref B: BL2AA2010202039 Ref C: 2024-10-10T18:44:26Z
Date : Thu, 10 Oct 2024 18:44:25 GMT

Body:
{
"Code": "InternalServerError",
"Message": "The remote name could not be resolved: 'waws-prod-bn1-013dr.api.azurewebsites.windows.net'",
"Target": null,
"Details": [
{
"Message": "The remote name could not be resolved: 'waws-prod-bn1-013dr.api.azurewebsites.windows.net'"
},
{
"Code": "InternalServerError"
},
{
"ErrorEntity": {
"Code": "InternalServerError",
"Message": "The remote name could not be resolved: 'waws-prod-bn1-013dr.api.azurewebsites.windows.net'"
}
}
],
"Innererror": null
}
```

### Environment data

```
Name Value
---- -----
PSVersion 7.2.23
PSEdition Core
GitCommitId 7.2.23
OS Microsoft Windows 10.0.22621
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
```

### Module versions

```
ModuleType Version PreRelease Name ExportedCommands
---------- ------- ---------- ---- ----------------
Script 3.0.2 Az.Accounts {Add-AzEnvironment, Clear-AzConfig, Clear-AzContext, Clear-AzDefault…}
Script 5.1.0 Az.KeyVault {Add-AzKeyVaultCertificate, Add-AzKeyVaultCertificateContact, Add-AzKeyVaultKey, Add-AzKe…
Script 6.13.0 Az.Resources {Export-AzResourceGroup, Export-AzTemplateSpec, Get-AzDenyAssignment, Get-AzDeployment…}
Script 1.2.2 Az.TrafficManager {Add-AzTrafficManagerCustomHeaderToEndpoint, Add-AzTrafficManagerCustomHeaderToProfile, A…
Script 3.1.2 Az.Websites {Add-AzWebAppAccessRestrictionRule, Add-AzWebAppTrafficRouting, Edit-AzWebAppBackupConfig…
```

### Error output

```
Message : Operation returned an invalid status code 'InternalServerError'
StackTrace : at Microsoft.Azure.Management.WebSites.WebAppsOperations.ListSnapshotsFromDRSecondaryWithHttpMessagesAsync(String resourceGroupName,
String name, Dictionary`2 customHeaders, CancellationToken cancellationToken)
at Microsoft.Azure.Management.WebSites.WebAppsOperationsExtensions.ListSnapshotsFromDRSecondaryAsync(IWebAppsOperations operations, String
resourceGroupName, String name, CancellationToken cancellationToken)
at Microsoft.Azure.Management.WebSites.WebAppsOperationsExtensions.ListSnapshotsFromDRSecondary(IWebAppsOperations operations, String
resourceGroupName, String name)
at Microsoft.Azure.Commands.WebApps.Utilities.WebsitesClient.GetSiteSnapshots(String resourceGroupName, String webSiteName, String
slotName, Boolean useDrSecondary)
at Microsoft.Azure.Commands.WebApps.Cmdlets.BackupRestore.GetAzureWebAppSnapshot.ExecuteCmdlet()
at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.<>c__3`1.b__3_0(T c)
at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.ExecuteSynchronouslyOrAsJob[T](T cmdlet, Action`1 executor)
at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.ExecuteSynchronouslyOrAsJob[T](T cmdlet)
at Microsoft.WindowsAzure.Commands.Utilities.Common.AzurePSCmdlet.ProcessRecord()
Exception : Microsoft.Azure.Management.WebSites.Models.DefaultErrorResponseException
InvocationInfo : {Get-AzWebAppSnapshot}
Line : $snapshot = (Get-AzWebAppSnapshot -Name $SourceName -ResourceGroupName $SourceResourceGroupName -UseDisasterRecovery -Debug)[0]
```

Start with ScenarioTests/WebAppBackupRestoreTests.ps1 around line 356 and trace Get-AzWebAppSnapshot into WebsitesClient.GetSiteSnapshots, as identified by the stack trace. Reproduce the -UseDisasterRecovery request and determine whether the failure is in the cmdlet path or the Azure Web Apps endpoint. Done means snapshot and restore with the flag complete without the reported InternalServerError.

Written by the indexing model from the issue text.