Rename onMeasureFullBackup to onEstimateFullBackupBytes in CTS tests

Bug: 430332837
Test: atest src/android/backup/cts/FullBackupLifecycleTest.java
Flag: com.android.server.backup.enable_cross_platform_transfer
Change-Id: I1d917c73e4cfdb70c147def3d1c9515f4f650232
2 files changed