set default ga_ux flag to true

this is a change to set the default value of ga_ux to true, as we have
the beta deprecation and this value will always be true.

Bug: 309518617
Test: atest com.android.adservices.service.customaudience.BackgroundFetchJobServiceTest com.android.adservices.service.adselection.AdSelectionServiceImplTest com.android.adservices.service.adselection.encryption.BackgroundKeyFetchJobServiceTest com.android.adservices.service.common.AdSelectionServiceFilterTest
Change-Id: Ie1bd3c04d6ea3b1abb7763d0999822b5a13850ed
5 files changed