[Feature Request]: Trim variable names before setting them

### What would you like to happen?

Migration: https://issues.apache.org/jira/browse/HOP-2467

Trailing white spaces like space, tab, CR and those kinds of things are hard to detect.
It's really better to trim them before trying to set a variable.

### Issue Priority

Priority: 3

### Issue Component

Component: API, Component: Hop Gui

Start by tracing where variables are set in the API and Hop Gui components. Check how names containing spaces, tabs, or carriage returns are handled, then verify that trimming occurs before assignment and that the resulting behavior is covered by the relevant existing checks.

Written by the indexing model from the issue text.