Shannen Doherty was allegedly booted off ‘Charmed’ by her co-star Alyssa Milano. The ‘Beverly Hills, 90210’ star, 52, who is battling stage 4 cancer, was said by Holly Marie Combs to have been let go from The WB witchcraft series as show bosses feared Alyssa would sue for a “hostile workplace environment” if Shannen was not forced out. Holly, 50, who starred alongside Shannen and Alyssa, 50, on the series, told on Monday’s (18.12.23) episode of Shannen’s ‘Let’s Be Clear’ podcast how she called a meeting with show producer Jonathan Levin, 51, in the early 2000s to get to the bottom of why her c…