### 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
int edit_height = p_from_line - p_to_line;
	int edit_size = ((edit_height == 0) ? p_from_col : 0) - p_to_col;
	Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (int j = 0; j < caret_edit_order.size(); j++) {
		if (caret_edit_order[j] == p_caret) {
			return;
		}
		
		
		int cc = get_caret_column(caret_edit_order[j]);
		if (edit_height != 0) {
			set_caret_line(get_caret_line(caret_edit_order[j]) + edit_height, false, true, 0, caret_edit_order[j]);
		}
		if (get_caret_line(p_caret) == get_caret_line(caret_edit_order[j])) {
			set_caret_column(cc + edit_size, false, caret_edit_order[j]);
		}
		
		if (!has_selection(caret_edit_order[j])) {
			continue;
		}
		if (edit_height != 0) {
			carets.write[caret_edit_order[j]].selection.from_line += edit_height;
			carets.write[caret_edit_order[j]].selection.to_line += edit_height;
		}
		if (get_caret_line(p_caret) == get_selection_from_line(caret_edit_order[j])) {
			carets.write[caret_edit_order[j]].selection.from_column += edit_size;
		}
	}
}
bool TextEdit::is_caret_visible(int p_caret) const {