### Godot version

4.1

### System information

Windows

### Issue description

Being able to have multiple cursors similarly to vscode is a great feature, however it's only possible to add carets, not remove them. By left clicking you can remove all extra cursors but you cannot remove a specific one so after selecting multiple lines a single missclick, you have to reselect them all again. Looking at the original pr there was a remove_caret function added so it would make sense to be able to remove carets when clicking again, like in vscode.

![image](https://github.com/godotengine/godot/assets/19669673/3867c00e-9faa-4429-9c6d-f2d6d3883044)


### Steps to reproduce

- Alt click to add multiple carets
- Alt click on the same position again
- Nothing happens

### Minimal reproduction project

N/A
const PackedInt32Array words = TS->shaped_text_get_word_breaks(text.get_line_data(get_caret_line(caret_idx))->get_rid());
			if (words.is_empty() || column <= words[0]) {
				
				column = 0;
			} else {
				
				for (int c = words.size() - 2; c >= 0; c = c - 2) {
					if (words[c] < column) {
						column = words[c];
						break;
					}
				}
			}
			
			int overlapping_caret_index = -1;
			for (int j = i + 1; j < caret_edit_order.size(); j++) {
				
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx) && (!has_selection(caret_edit_order[j]) || get_selection_to_line(caret_edit_order[j]) != get_caret_line(caret_idx))) {
					break;
				}
				
				if ((has_selection(caret_edit_order[j]) && get_selection_to_column(caret_edit_order[j]) < column)) {
					break;
				}
				
				if ((has_selection(caret_edit_order[j]) && get_selection_from_column(caret_edit_order[j]) < column)) {
					carets.write[caret_edit_order[j]].selection.to_column = column;
					overlapping_caret_index = caret_edit_order[j];
					break;
				}