Use VirtualStorageProvider::new_overlay(test_data_root()) in tests#726

arrayka merged 3 commits intomainmicrosoft/DiskANN:mainfrom

copilot/update-unit-tests-to-use-virtualstorageprovidermicrosoft/DiskANN:copilot/update-unit-tests-to-use-virtualstorageproviderCopy head branch name to clipboard