Update tests package name as com.glencoesoftware.omero.zarr

Matches the repacking of the source code under the same namespace
Also rename the ZarrPixelsServiceTest to match the PixelsService subclass

src/test/java/com/glencoesoftware/omero/ms/core/ZarrPixelBufferTest.java → src/test/java/com/glencoesoftware/omero/zarr/ZarrPixelBufferTest.java

@@ -16,7 +16,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-package com.glencoesoftware.omero.ms.core;
+package com.glencoesoftware.omero.zarr;
 
 import java.awt.Dimension;
 import java.io.File;

src/test/java/com/glencoesoftware/omero/ms/core/PixelsServiceTest.java → src/test/java/com/glencoesoftware/omero/zarr/ZarrPixelsServiceTest.java

@@ -16,7 +16,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-package com.glencoesoftware.omero.ms.core;
+package com.glencoesoftware.omero.zarr;
 
 import java.io.IOException;
 import java.io.File;
@@ -43,7 +43,7 @@
 import static omero.rtypes.rlong;
 import static omero.rtypes.rstring;
 
-public class PixelsServiceTest {
+public class ZarrPixelsServiceTest {
 
   private ZarrPixelsService pixelsService;
   private String uuid = UUID.randomUUID().toString();