By Kannaki Deka and Lisa Baertlein (Reuters) -FedEx Corp’s new chief executive must show he can play catch up on costs without further eroding service, Wall Street analysts said on Friday, after the global delivery company laid out plans to slash up to $2.7 billion in expenses for fiscal 2023. FedEx’s plan announced on Thursday escalates pressure on CEO Raj Subramaniam to address internal missteps and adjust to a darkening global economy that hammered the company’s fiscal first-quarter profits. Some analysts said they are no longer giving the CEO – who succeeded FedEx founder Fred Smith in Jun…