Switching Data Loss Prevention Client-Side Checks for OWA

Purview Data Loss Prevention (DLP) rule checks can happen client-side and server-side. This change updates the Exchange Online organization configuration to instruct OWA to stop using Exchange Online to detect potential DLP rule violations before users send email. Instead, OWA will use the workload-neutral Data Classification Services (DCS). Using a workload-neutral service comes with some consequences in terms of OWA being unable to evaluate Exchange-specific predicates.