By Veronika Bondarenko Hiring freeze also being imposed as part of cost-cutting moves. Ever since agreeing to be sold to Elon Musk for $44 billion, Twitter (TWTR) – Get Twitter, Inc. Report’s been in a constant state of upheaval — amid rising employee concern over their futures at the company, two of the platform’s big leaders have been pushed out. Twitter CEO Parag Agrawal has, according to an internal memo obtained by the New York Times, asked General Manager of Consumer Kayvon Beykpour and General Manager of Revenue Bruce Falck to leave the company for vague reasons explained as the need to…