Change name of getIconsPosition_afterIconRemoved_notContained to uninstallWorkspaceIcon

The name doesn't make clear what the test is doing and
it doesn't follow our naming conventions. Also, adding
comment to explain what the test is doing.

Bug: 298234173
Test: atest UninstallWorkspaceIcon
Change-Id: Icdc42e891a94d159fc07e69931ea8444d882ad56

tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java

@@ -597,10 +597,13 @@ public class TaplTestsLauncher3 extends AbstractLauncherUiTest {
         }
     }
 
+    /**
+     * Adds three icons to the workspace and removes one of them by dragging to uninstall.
+     */
     @Test
     @ScreenRecord // b/241821721
     @PlatinumTest(focusArea = "launcher")
-    public void getIconsPosition_afterIconRemoved_notContained() throws IOException {
+    public void uninstallWorkspaceIcon() throws IOException {
         Point[] gridPositions = getCornersAndCenterPositions();
         StringBuilder sb = new StringBuilder();
         for (Point p : gridPositions) {