### 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_line, text.size(), 0);
	if (p_wrap_index != -1) {
		return text[p_line].data_buf->get_line_width(p_wrap_index);
	}
	return text[p_line].data_buf->get_size().x;
}
int TextEdit::Text::get_line_height() const {
	return line_height;
}
void TextEdit::Text::set_width(float p_width) {
	width = p_width;
}
float TextEdit::Text::get_width() const {
	return width;
}
void TextEdit::Text::set_brk_flags(BitField<TextServer::LineBreakFlag> p_flags) {
	brk_flags = p_flags;
}
BitField<TextServer::LineBreakFlag> TextEdit::Text::get_brk_flags() const {
	return brk_flags;
}
int TextEdit::Text::get_line_wrap_amount(int p_line) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	return text[p_line].data_buf->get_line_count() - 1;
}
Vector<Vector2i> TextEdit::Text::get_line_wrap_ranges(int p_line) const {