[Doc]: Get-AzKeyVaultSecret breaking change - Certificate-backed secrets will no longer be returned when listing secrets.

### Type of issue

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### Feedback

Az.KeyVault version 7 will have a breaking change for the Get-AzKeyVaultSecret cmdlet, [detailed here](https://learn.microsoft.com/en-us/powershell/azure/upcoming-breaking-changes?view=azps-15.5.0#azkeyvault), which says the following:

`Certificate-backed secrets will no longer be returned when listing secrets. Use the certificate cmdlets (Get-AzKeyVaultCertificate) to manage these secrets.`

We are currently using Get-AzKeyVaultSecret to get certificates with their private key. Get-AzKeyVaultCertificate does not return the private key, as far as I know. Does the warning mean it will not return the secrets when "listing" all the secrets in the key vault i.e. using Get-AzKeyVaultSecret without the `-Name` parameter? That will not impact us, if so.

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