(Reuters) - Activist investor Elliott Management said on Tuesday it has built a stake of more than $2 billion in human resources software provider Workday (WDAY), while voicing support for the company's leadership. WorkDay stock rose 9% before the bell on Wednesday. Elliott praised Workday's chief executive officer and chief financial officer, citing strong progress in recent years and describing its management team as proven and effective. The investor added it was pleased with its dialogue with the co ...