Move classes inside of CellLayoutBoard to their own file

Previous step for adding unit testing for MultipageCellLayout.

Flag: LEGACY FOLDABLE_SINGLE_PAGE DISABLED
Bug: 270395274
Test: ReorderAlgorithmUnitTest
Change-Id: Ia5ca0b10481d7a21883594434b3406fb3a5ccf0b
diff --git a/tests/Android.bp b/tests/Android.bp
index 8725b46..84c3951 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -33,8 +33,8 @@
 filegroup {
     name: "launcher-image-tests-src",
     srcs: [
-      "src/com/android/launcher3/celllayout/TestWorkspaceBuilder.java",
-      "src/com/android/launcher3/celllayout/CellLayoutBoard.java",
+      "src/com/android/launcher3/celllayout/board/*.java",
+      "src/com/android/launcher3/celllayout/board/*.kt",
       "src/com/android/launcher3/celllayout/FavoriteItemsTransaction.java",
       "src/com/android/launcher3/ui/AbstractLauncherUiTest.java",
       "src/com/android/launcher3/ui/PortraitLandscapeRunner.java",