[Feature Request]: Add option "Exclude 'Field to split' from output' to transform "Split field to rows"

### What would you like to happen?

The "Split field to rows" transform breaks strings into rows by a certain delimiter.

Currently, the output shows every value in a new row as expected. But then, it also repeats the full original string for each row.

For example:

"Field to split" is "Licenses_String", and "New field name" is "Licenses".
The output shows both columns "Licenses_String" and "Licenses". At this point, we usually don't need the "field to split" anymore.

I'd like to have an option "Exclude 'Field to split' from Output".
The current solution is to add a "Select" transform and drop the "Field to split" there.

### Issue Priority

Priority: 3

### Issue Component

Component: Hop Gui

The issue identifies the “Split field to rows” transform in Hop Gui but names no files or tests. Start by locating that transform’s GUI definition and its output-field handling, then compare the requested option with the current Select-transform workaround. Done means the option is available and the original field is omitted when selected, while existing behavior remains unchanged.

Written by the indexing model from the issue text.