try installing test deps no matter what

Author: henrygerardmoore

data_tamer_cpp/package.xml

@@ -20,9 +20,8 @@
   <depend>rclcpp_lifecycle</depend>
   <depend>mcap_vendor</depend>
   <depend>data_tamer_msgs</depend>
-
-  <test_depend>ament_cmake_gtest</test_depend>
-  <test_depend>gtest_vendor</test_depend>
+  <depend>ament_cmake_gtest</depend>
+  <depend>gtest_vendor</depend>
 
   <export>
       <build_type>ament_cmake</build_type>