[DocsUI] Update grid/list view state to be a global setting.

Previously, grid/list states were saved per root/sidetab vs. as a
global setting. This CL allows the grid/list view states to persist
after changing roots/sidetabs.

Bug: 370629029
Test: m DocumentsUI && manual inspection
Test: atest FilesActivityUiTest#testRootChange_GlobalGridListViewState
Test: atest FilesActivityUiTest#testRootChange_UpdatesSortHeader
      && flag useMaterial3 off
Flag: com.android.documentsui.flags.use_material3
Change-Id: I756b37f6b46eabedfc2aa68661312691ec0ab5fb