PHILADELPHIA — Pennsylvania’s Republican Senate primary may turn on how GOP voters answer one question: Is Mehmet Oz really a conservative? When former President Donald Trump endorsed the celebrity surgeon known as “Dr. Oz,” he called the candidate “Pro-Life, very strong on Crime, the Border” and other issues. Oz, Trump said earlier this month, “will always fight for and support our under-siege Second Amendment.” But Oz, campaigning as a “conservative outsider,” has a long history of statements on TV, radio and in print that run counter to conservative beliefs. He’s expressed concerns about ab…