SAN FRANCISCO — It had been so long since the Giants had hosted one of these that Farhan Zaidi found himself wondering Friday morning the last time he wore a tie. Devoid of postseason baseball for all but five games in 2021, absent any marquee acquisitions to parade in front of fans and media, the Giants’ top baseball executive has had no reason to dress up. Likewise, the absence of a proper interview room has largely gone unnoticed. But, officially introducing $113 million dollar man Jung Hoo Lee, that changed Friday. “It’s been a while,” Zaidi said off to the side of the makeshift stage erec…