By Jelani Scott The Giants manager announced his protest in response to a mass shooting at an elementary school in Texas earlier this week. Editor’s note: This story contains details of a mass casualty event and gun violence. White Sox manager Tony La Russa weighed in Saturday on Gabe Kapler’s decision to not participate in the national anthem in response to a mass shooting at Robb Elementary School in Uvalde, Texas earlier this week. The Giants manager announced Friday in the aftermath of Tuesday’s tragedy that he will no longer take the field for the national anthem prior to San Francisco’s …