Get-AzCostManagementExport always returns empty even though Azure portal shows exports (export APIVersion issue)

### Description

I've tested this behavior on multiple Azure subscriptions in different tenants, all repro.

1. Goto Azure subscription, Login with Admin User, and create an Export in Cost Management portal (in type of daily export current month cost)
2. After it is created, I can see the cost export in the Exports list,

3. also check network request looks good:
https://management.azure.com/subscriptions/3d1470c1-b155-4b2e-b3d4-03a20062840f/providers/Microsoft.CostManagement/exports?api-version=2023-07-01-preview&$expand=runHistory

Now switch to Az module:
1. Connect to the same Azure subscription using the same Admin User:
Connect-AzAccount -Credential $psCred -Subscription 3d1470c1-b155-4b2e-b3d4-03a20062840f

3. Get-AzCostManagementExport -Scope 'subscriptions/3d1470c1-b155-4b2e-b3d4-03a20062840f'
Nothing returned

If you look at below Debug output, you can tell the powershell module is using apiversion 2021-10-01, but the portal is using new one in 2023, If i edit the network request to use the same api version as the PowerShell module, it returns nothing either:

### Issue script & Debug output

```PowerShell
DEBUG: [CmdletBeginProcessing]: Starting command
DEBUG: CmdletBeginProcessing:
DEBUG: CmdletProcessRecordStart:
DEBUG: CmdletGetPipeline:
DEBUG: CmdletBeforeAPICall:
DEBUG: URLCreated: /subscriptions/3d1470c1-b155-4b2e-b3d4-03a20062840f/providers/Microsoft.CostManagement/exports?api-version=2021-10-01
DEBUG: RequestCreated: /subscriptions/3d1470c1-b155-4b2e-b3d4-03a20062840f/providers/Microsoft.CostManagement/exports?api-version=2021-10-01
DEBUG: HeaderParametersAdded:
DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://management.azure.com/subscriptions/3d1470c1-b155-4b2e-b3d4-03a20062840f/providers/Microsoft.CostManagement/exports?api-version=2021-10-01

Headers:
x-ms-unique-id : 7
x-ms-client-request-id : c6086f18-b17e-484e-ba57-8045b4c395ba
CommandName : Get-AzCostManagementExport
FullCommandName : Get-AzCostManagementExport_List
ParameterSetName : __AllParameterSets
User-Agent : AzurePowershell/v0.0.0,PSVersion/v7.4.5,Az.CostManagement/0.0.0

Body:

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

Status Code:
OK

Headers:
Cache-Control : no-cache
Pragma : no-cache
Vary : Accept-Encoding
session-id : 7424d798-63e5-4d63-865c-d56e6c9b705b
x-ms-request-id : 53414cde-e9ff-4538-9706-7726952ce794
x-ms-correlation-request-id : 9943626c-ddfb-4371-9f7c-ff85b5478d59
x-ms-client-request-id : c6086f18-b17e-484e-ba57-8045b4c395ba
X-Powered-By : ASP.NET
x-ms-ratelimit-remaining-subscription-reads: 499
x-ms-ratelimit-remaining-subscription-global-reads: 7499
x-ms-routing-request-id : WESTUS2:20240904T225312Z:9943626c-ddfb-4371-9f7c-ff85b5478d59
Strict-Transport-Security : max-age=31536000; includeSubDomains
X-Content-Type-Options : nosniff
X-Cache : CONFIG_NOCACHE
X-MSEdge-Ref : Ref A: 5A36C91BEDFA4CDAB1DFAF12F0F77727 Ref B: CO6AA3150220045 Ref C: 2024-09-04T22:53:11Z
Date : Wed, 04 Sep 2024 22:53:11 GMT

Body:
{
"value": []
}

DEBUG: ResponseCreated:
DEBUG: BeforeResponseDispatch:
DEBUG: Finally:
DEBUG: CmdletAfterAPICall:
DEBUG: [CmdletProcessRecordAsyncEnd]: Finish HTTP process
DEBUG: CmdletProcessRecordAsyncEnd:
DEBUG: CmdletProcessRecordEnd:
DEBUG: AzureQoSEvent: Module: Az.CostManagement:0.3.2; CommandName: Get-AzCostManagementExport; PSVersion: 7.4.5; IsSuccess: True; Duration: 00:00:00.4049409; SanitizeDuration: 00:00:00.0000180
```

### Environment data

```PowerShell
Name Value
---- -----
PSVersion 7.4.5
PSEdition Core
GitCommitId 7.4.5
OS Microsoft Windows 10.0.22631
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
ModuleType Version PreRelease Name ExportedCommands
---------- ------- ---------- ---- ----------------
Script 3.0.4 Az.Accounts {Add-AzEnvironment, Clear-AzConfig, Clear-AzConte…
Script 0.3.2 Az.CostManagement {Get-AzCostManagementExport, Get-AzCostManagement…
Script 7.4.0 Az.Resources {Export-AzResourceGroup, Export-AzTemplateSpec, G…
Script 7.3.0 Az.Storage {Add-AzRmStorageContainerLegalHold, Add-AzStorage…
```

### Error output

_No response_

Start at the Get-AzCostManagementExport entry point and inspect how its list request selects the Cost Management API version. Reproduce the command against the subscription described in the issue, then verify that the command returns the exports shown in the Azure portal using the supported API version.

Written by the indexing model from the issue text.