### 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
for (int j = 1; j < words.size(); j = j + 2) {
				if (words[j] > column) {
					column = words[j];
					break;
				}
			}
			next_line = line;
			next_column = column;
			
			for (int j = i - 1; j >= 0; j--) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (get_caret_column(caret_edit_order[j]) > column) {
					break;
				}
				carets_to_remove.push_back(caret_edit_order[j]);
			}
		} else {
			
			if (caret_mid_grapheme_enabled) {
				next_column = get_caret_column(caret_idx) < curline_len ? (get_caret_column(caret_idx) + 1) : 0;
			} else {
				next_column = get_caret_column(caret_idx) < curline_len ? TS->shaped_text_next_character_pos(text.get_line_data(get_caret_line(caret_idx))->get_rid(), (get_caret_column(caret_idx))) : 0;
			}
			
			if (i > 0) {
				int prev_caret_idx = caret_edit_order[i - 1];
				if (get_caret_line(prev_caret_idx) == next_line && get_caret_column(prev_caret_idx) == next_column) {
					carets_to_remove.push_back(prev_caret_idx);