As one of Hollywood’s more restless pop myth-makers, Robert Rodriguez seems determined to continue cranking out sequels to his most beloved movies, regardless of whether or not the public asked for them. The question of whether or not these narrative continuations are strictly necessary seems almost irrelevant when one considers the infectious degree of unfettered moviemaking zeal that Rodriguez generously pours into each new project, whether it’s the James Cameron-assisted cyberpunk actioner “Alita: Battle Angel,” or stepping in to direct an episode of “The Mandalorian.”