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
1 file changed