Remove-Workspace should be able to remove a workspace by name

### Problem description

Although this is not covered by the WebAPI I think we should add this as a convenient feature to delete a workspace by name. 

Quick question: Workspace Names are unique inside the tenant right?

### Verbose logs

```text
na
```

### Module Version

0.29.0 

### Suggested solution

Remove-FabricWorkspace -name "MyImportantFabricWorkspace"