Az breaking change to split certificates from Get-AzKeyVaultSecret

### Description

As per the discussion title, the up coming breaking change to Az.Keyvault, see:
https://learn.microsoft.com/en-us/powershell/azure/upcoming-breaking-changes?view=azps-15.6.0#get-azkeyvaultsecret

States that certificates will be split out into their own cmdlet.
Is this change being lined up with a change the to [Secrets Management Module](https://github.com/PowerShell/SecretManagement) to ensure that there's no impact?

Apologies if this has already been raised, I couldnt see any other issues or documentation about this.

```
WARNING: Upcoming breaking changes in the cmdlet 'Get-AzKeyVaultSecret' :
Certificate-backed secrets will no longer be returned when listing secrets. Use the certificate cmdlets (Get-AzKeyVaultCertificate) to manage these secrets.
- The change is expected to take effect in Az version : '16.0.0'
- The change is expected to take effect in Az.KeyVault version : '7.0.0'
```

### Script or Debug output

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### Error output

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