Salesforce Inc. and ServiceNow Inc. are each in advanced talks to invest about $750 million apiece in Genesys Cloud Services Inc., according to people familiar with the matter.The separate investments — totaling roughly $1.5 billion — would be a rare instance of enterprise software rivals backing the same company. Genesys, which makes AI-powered software for customer contact centers, would be valued at roughly $15 billion, the people said....