Fix InteratAcrossProfilesDetails window leak

activity was being finished without dismissing alertdialog when activity
is launched from an app. causing window leak

1. dismiss dialog and remove reference when activity is destroyed
2. dismiss dialog if it is already showing when mDialog.show() is called

Test: Manually tested
Flag: EXEMPT bugfix
Bug: 417379811
Change-Id: I27a4ac2ade083594240d635a403c47a75351afa1