Fix misleading error message GitProviderResourceNotFound

[svenchio]

In this example, I'm using an Azure DevOps - Source Control connection configured with Service Principal authentication as shown on the image below 

Using this connection, I'm invoking a interface Git - Connect - REST API (Core) | Microsoft Learn , following the example provided in Connect a workspace to Azure DevOps using configured connection example  and implemented using PowerShell script, in the image below you can see how the call is correct, but I'm getting an error "{"requestId":"xxxxxxxx-xxxx-xxxx-xxxxxxxxxx","errorCode":"GitProviderResourceNotFound","message":"The requested operation can't be completed because the Git provider resource could not be found using the provided Git connection details."}" 

After a LONG INVESTIGATION following what the error suggested the problem was (e.g. ID of the connection incorrect, lack of permissions, etc)  and ruling-out many alternatives, I concluded that it wasn't none of this but the issue was that, on the target branch reference in the example shown "workspace/ws_test-auto-deploy_dev" did not contain "directoryName": "/fabric" 

This is why the return error message GitProviderResourceNotFound is very misleading and should be more granular, it would have same me a lot of time something different like "BranchMissingDirectory" instead.