Remove-AzWebAppCertificate is slow

### Description

`Remove-AzWebAppCertificate` API is extremely slow.

I run into issue with having more then 800 TLS/SSL certificates, so I checked why there are so many to discover we weren't cleaning the old expired certificates. So I created a script to clean them.

And then I found `Remove-AzWebAppCertificate` API is incredibly slow. Average response time was around 30 seconds. But sometimes as long as 180 and even 300 seconds.

Try to imagine deleting 800 certificates with such a speed...

Now I will use `Invoke-AzRestMethod -Method DELETE -Path $Path;` to delete the certificates as it is sooo much faster. But I think `Remove-AzWebAppCertificate` should be on par with it.

### Issue script & Debug output

```PowerShell
$resourceGroupName = '.....';
$certificates = Get-AzWebAppCertificate -ResourceGroupName $resourceGroupName
$date = Get-Date -Year 2024 -Month 02 -Day 01
$expiredCertificates = $certificates | Where-Object { $_.ExpirationDate -lt $date };

foreach ($cert in $expiredCertificates) {
Remove-AzWebAppCertificate -ResourceGroupName $resourceGroupName -Thumbprint $cert.Thumbprint;
Write-Output ("Removed " + $cert.Thumbprint);
}
```

### Environment data

```PowerShell
Name Value
---- -----
PSVersion 7.4.1
PSEdition Core
GitCommitId 7.4.1
OS CBL-Mariner/Linux
Platform Unix
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 2.15.1 Az.Accounts {Add-AzEnvironment, Clear-AzConfig, Clear-AzContext, Clear-AzDefault…}
Script 7.1.1 Az.Compute {Add-AzImageDataDisk, Add-AzVhd, Add-AzVMAdditionalUnattendContent, Add-AzVMDataDisk…}
Script 7.4.0 Az.Network {Add-AzApplicationGatewayAuthenticationCertificate, Add-AzApplicationGatewayBackendAddressPool, Add-AzApplicationGatewayBackendHttpSetting…
Script 6.15.0 Az.Resources {Export-AzResourceGroup, Export-AzTemplateSpec, Get-AzDenyAssignment, Get-AzDeployment…}
Script 6.1.1 Az.Storage {Add-AzRmStorageContainerLegalHold, Add-AzStorageAccountManagementPolicyAction, Add-AzStorageAccountNetworkRule, Close-AzStorageFileHandle…
Script 1.1.3 Az.Tools.Predictor {Disable-AzPredictor, Enable-AzPredictor, Open-AzPredictorSurvey, Send-AzPredictorRating}
Script 3.2.0 Az.Websites {Add-AzWebAppAccessRestrictionRule, Add-AzWebAppTrafficRouting, Edit-AzWebAppBackupConfiguration, Get-AzAppServiceEnvironment…}
Script 0.0.0.10 AzureAD.Standard.Preview {Add-AzureADApplicationOwner, Add-AzureADDeviceRegisteredOwner, Add-AzureADDeviceRegisteredUser, Add-AzureADDirectoryRoleMember…}
Script 0.9.3 AzurePSDrive
```

### Error output

_No response_