### 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
ERR_FAIL_INDEX_V(p_caret, carets.size(), -1);
	ERR_FAIL_COND_V(!has_selection(p_caret), -1);
	return carets[p_caret].selection.from_column;
}
int TextEdit::get_selection_to_line(int p_caret) const {
	ERR_FAIL_INDEX_V(p_caret, carets.size(), -1);
	ERR_FAIL_COND_V(!has_selection(p_caret), -1);
	return carets[p_caret].selection.to_line;
}
int TextEdit::get_selection_to_column(int p_caret) const {
	ERR_FAIL_INDEX_V(p_caret, carets.size(), -1);
	ERR_FAIL_COND_V(!has_selection(p_caret), -1);
	return carets[p_caret].selection.to_column;
}
void TextEdit::deselect(int p_caret) {
	ERR_FAIL_COND(p_caret > carets.size());
	for (int i = 0; i < carets.size(); i++) {
		if (p_caret != -1 && p_caret != i) {
			continue;
		}
		carets.write[i].selection.active = false;
	}
	caret_index_edit_dirty = true;
	queue_redraw();
}
void TextEdit::delete_selection(int p_caret) {