[BPMN Editor] Script Editor - Remove use of minimap

In the script editor display area is so small that only a couple of words of the code are visible. Additionally, a thumbnail view
that could not be closed, appears on the right, which eliminates more space and reduce even more the code editing area.

We thought it would be necessary to solve this problem:

• To have a button to be able to maximize the code area.
• To be able to move, or close the thumbnail view

Acceptance criteria

Monaco preview (thumbnail) of the script editor is removed from all nodes in process Designer.