Make adding AND/OR conditions in segments clearer

### Is your feature request related to a problem?

Based on customer feedback, it might be good to look at how the UI for adding segment conditions is structured.

We have add AND condition at the bottom of the page but the option to add an OR condition is less obvious.

Perhaps both buttons should be alike and next to each other to make it clear that there are two options. Otherwise users might miss the OR option and default to AND inadvertently.

### Describe the solution you'd like.

Make the option for adding AND or OR conditions clearer by having them next to each other in the UI.

### Describe alternatives you've considered

Leaving them as is, but maybe add some explanatory text into the UI to make it more obvious.

### Additional context

_No response_