Description:

Currently, the Python Task wizard and Python Calculator wizard offer a Python editor with the following behavior:

• Ctrl+S is available both globally in GTlab (for saving the project) and in the Python wizard.
• In the Python wizard, Ctrl+S only transfers the script from the editor to the data model object (task or calculator); it does not persist the project to disk.
• Closing the wizard via the Cancel button discards any changes made since the last Ctrl+S in the wizard.
• Closing the wizard via the wizard's close ("X") button opens a "Do you want to save..." message box, which only allows saving or discarding changes made since the last Ctrl+S in the wizard.

This leads to confusion for users due to inconsistent save behavior between GTlab's main GUI and the wizard.

Changes in this PR:

• The Save button and Ctrl+S shortcut were removed from the wizard to avoid conflicting behaviors.
• The script is now automatically transferred from the editor to the corresponding data model object whenever the wizard loses focus (e.g., the user clicks in the main GUI) or when the wizard is closed.
• The Cancel button and the "Do you want to save..." message box were removed, since all changes are now automatically applied to the data model and can be undone via GTlab's Undo/Redo system.

Benefits:

• Removes confusion caused by different save mechanisms.
• Guarantees that changes in the Python editor are always reflected in the data model.
• Users can edit scripts and execute the corresponding process element immediately without needing to worry about manual saves.
• When the Python Wizard is open and the user clicks Undo/Redo in the main GUI, the script in the wizard's editor is updated to the corresponding change.