Gracefully continue with a warning when the app already exists after trying to apply provisioning template twice

[svermaak]

Is your feature request related to a problem? Please describe.
Invoke-PnPSiteTemplate: {"odata.error":{"code":"-1, System.InvalidOperationException","message":{"lang":"en-US","value":"An instance of this App already exists at the specified location."}}}

A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
When I run a provisioning template over an existing site it fails when an app is already installed and the template tries to install it again

Describe the solution you'd like
When running a provisioning template over an existing site, I want the app install part to gracefully continue with a warning when the app already exists

Describe alternatives you've considered
I have two templates. One with apps and one without

Additional context
Invoke-PnPSiteTemplate -InputInstance $template -Parameters $templateParameters -Connection $connection;
WARNING: Folder 'Folder1' already exists in parent folder '/sites/xxxx/Shared Documents'.
WARNING: Folder 'Folder2' already exists in parent folder '/sites/xxxx/Shared Documents'.
WARNING: Folder 'Folder3' already exists in parent folder '/sites/xxxx/Shared Documents'.
Invoke-PnPSiteTemplate: {"odata.error":{"code":"-1, System.InvalidOperationException","message":{"lang":"en-US","value":"An instance of this App already exists at the specified location."}}}