C Sharp action file name is not getting validated for duplicated names

### Describe the Bug with repro steps

1. Create a Standard Logic App
2. Create a stateful workflow
3. Add any trigger
4. Add the "Execute CSharp Script Code"
5. Add the "Execute CSharp Script Code" again
6. Change the name of the second file to the first file name
7. Save

This will break the UI next time the user opens it and the Logic App, making it unable to update thew workflow.json

### What type of Logic App Is this happening in?

Standard (Portal)

### Which operating system are you using?

MacOS

### Did you refer to the TSG before filing this issue? [https://aka.ms/lauxtsg]()

Yes

### Workflow JSON

```json
N/A
```

### Screenshots or Videos

*No response*

### Browser

Edge

### Additional context

*No response*