[Hotfix][ams] Fix ResourceMapper.selectResourcesByGroup result mapping (#4194)

The @Result property names did not match the fields on Resource:
- group -> groupName
- container -> containerName
- totalMemory -> memoryMb

The start_time column and its @Result mapping were removed because
Resource has no startTime field; MyBatis would silently drop it anyway.

This method is currently only declared/implemented via
DefaultOptimizerManager.listResourcesByGroup with no caller on master,
so no behavioral change is observable. Fixing it now unblocks any future
caller (e.g. auto-restart feature) from getting back empty-field Resource
objects.

Author: lintingbin

amoro-ams/src/main/java/org/apache/amoro/server/persistence/mapper/ResourceMapper.java

@@ -59,15 +59,14 @@ public interface ResourceMapper {
   ResourceGroup selectResourceGroup(@Param("resourceGroup") String groupName);
 
   @Select(
-      "SELECT resource_id, group_name, container_name, start_time, thread_count, total_memory, properties"
+      "SELECT resource_id, group_name, container_name, thread_count, total_memory, properties"
           + " FROM resource WHERE group_name = #{resourceGroup}")
   @Results({
     @Result(property = "resourceId", column = "resource_id"),
-    @Result(property = "group", column = "group_name"),
-    @Result(property = "container", column = "container_name"),
-    @Result(property = "startTime", column = "start_time", typeHandler = Long2TsConverter.class),
+    @Result(property = "groupName", column = "group_name"),
+    @Result(property = "containerName", column = "container_name"),
     @Result(property = "threadCount", column = "thread_count"),
-    @Result(property = "totalMemory", column = "total_memory"),
+    @Result(property = "memoryMb", column = "total_memory"),
     @Result(property = "properties", column = "properties", typeHandler = Map2StringConverter.class)
   })
   List<Resource> selectResourcesByGroup(@Param("resourceGroup") String groupName);