By Saeed Azhar and Sinéad Carew (Reuters) – A dearth of IPOs, a plunge in stock prices and slowing global economic growth are clouding the outlook for revenue at global investment banks after pandemic spending by governments and central banks fueled a blockbuster 2021.Russia’s invasion of Ukraine and significant monetary tightening have led to volatile trading in financial markets this year. While that can help trading volumes, it however slowed initial public offerings (IPOs) and deals led by special purpose acquisition companies (SPACs). Global investment banking’s net revenue fell to $35.6 …