Reapply "Remove all instances of file names from ActivityTestJunit4"

This reverts commit 4ea44738ac0249c8fa33686e13ccb66ee397ce10.

Bug: 407646510
Test: atest DocumentsUIGoogleTests
Flag: EXEMPT test change
Change-Id: Ib85d27c1a873fd5671ed28157907e5024f9da812
9 files changed