Initialize Variable has Option to Add Multiple Variables whereas Set Variable doesn't have that Option !!

### Severity

P4 - Low (Cosmetic/minor inconvenience)

### Describe the Bug with repro steps

We need to have a provision to 'Add Variable' inside 'Set Variable' action like in the case of 'Initialize Variable'.

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

Consumption (Portal)

### Are you experiencing a regression?

_No response_

### Which operating system are you using?

Windows

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

Yes

### Workflow JSON

```json

```

### Screenshots or Videos

Seen on Initialize Variables:

But, this is missing in Set Variable

### Environment

-Browser- Google Chrome.

### Additional context

We need to be able to 'Add Variable' in case of Set Variable as well like in the case of 'Initialize Variable'