Revert^2 "[DocsUI, Search]: Add extras about slow search."

This reverts commit 344df901.

Reason for revert: Incorporating changes introduced by ag/33656528

Bug: 417818526
Test: m DocumentsUIGoogle
Flag: com.android.documentsui.flags.use_search_v2_read_only

Change-Id: I2bbada40bf824ab782facb908bd388de4239fdf5