BOSTON — The Bruins don’t control their own destiny in the race for the final two playoff spots in the Eastern Conference. That said, the B’s will give themselves a great chance to qualify if they bring the same defensive performance to Saturday’s regular-season finale that we saw in the last two games. The Bruins gave the Red Wings very little in Thursday night’s 5-2 win at TD Garden. Boston gave up just 15 shots on goal, tying a season low previously set March 29 at New Jersey. Perhaps most impressive was Detroit’s five shot attempts at even strength in the third period, which shows how well Boston clamped down defensively while protecting a