remove duplicate tags/groups (#3343)

lm_eval/tasks/longbench2/_longbench2.yaml

 group: longbench2
 task:
-  - longbench2_history
-  - longbench2_incontext
-  - longbench2_multi
-  - longbench2_single
-  - longbench2_structured
+  - longbench2_history_tasks
+  - longbench2_incontext_tasks
+  - longbench2_multi_tasks
+  - longbench2_single_tasks
+  - longbench2_structured_tasks
   - longbench2_code
 aggregate_metric_list:
   - metric: acc

lm_eval/tasks/longbench2/academic_multi_doc.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_multi
+  - longbench2_tasks
+  - longbench2_multi_tasks
 task: longbench2_academic_multi
 dataset_name: academic_multi

lm_eval/tasks/longbench2/academic_single.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_single
+  - longbench2_tasks
+  - longbench2_single_tasks
 task: longbench2_academic_single
 dataset_name: academic_single

lm_eval/tasks/longbench2/agent_history.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_history
+  - longbench2_tasks
+  - longbench2_history_tasks
 task: longbench2_agent_history
 dataset_name: agent_history_qa

lm_eval/tasks/longbench2/detective.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_single
+  - longbench2_tasks
+  - longbench2_single_tasks
 task: longbench2_detective
 dataset_name: detective

lm_eval/tasks/longbench2/dialogue_history.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_history
+  - longbench2_tasks
+  - longbench2_history_tasks
 task: longbench2_dialogue_history
 dataset_name: dialogue_history_qa

lm_eval/tasks/longbench2/event_order.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_single
+  - longbench2_tasks
+  - longbench2_single_tasks
 task: longbench2_event_order
 dataset_name: event_ordering

lm_eval/tasks/longbench2/fin_multi_doc.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_multi
+  - longbench2_tasks
+  - longbench2_multi_tasks
 task: longbench2_fin_multi
 dataset_name: financial_multi

lm_eval/tasks/longbench2/fin_single_doc.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_single
+  - longbench2_tasks
+  - longbench2_single_tasks
 task: longbench2_fin_single
 dataset_name: financial_single

lm_eval/tasks/longbench2/govt_multi_doc.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_multi
+  - longbench2_tasks
+  - longbench2_multi_tasks
 task: longbench2_govt_multi
 dataset_name: government_multi

lm_eval/tasks/longbench2/govt_single_doc.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_single
+  - longbench2_tasks
+  - longbench2_single_tasks
 task: longbench2_govt_single
 dataset_name: government_single

lm_eval/tasks/longbench2/graph.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_structured
+  - longbench2_tasks
+  - longbench2_structured_tasks
 task: longbench2_graph
 dataset_name: graph_reasoning

lm_eval/tasks/longbench2/legal_multi.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_multi
+  - longbench2_tasks
+  - longbench2_multi_tasks
 task: longbench2_legal_multi
 dataset_name: legal_multi

lm_eval/tasks/longbench2/legal_single.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_single
+  - longbench2_tasks
+  - longbench2_single_tasks
 task: longbench2_legal_single
 dataset_name: legal_single

lm_eval/tasks/longbench2/lit_single_doc.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_single
+  - longbench2_tasks
+  - longbench2_single_tasks
 task: longbench2_lit_single
 dataset_name: literary

lm_eval/tasks/longbench2/longbench2_code.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
+  - longbench2_tasks
 task: longbench2_code
 dataset_name: code_repo_qa

lm_eval/tasks/longbench2/many_shot.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_incontext
+  - longbench2_tasks
+  - longbench2_incontext_tasks
 task: longbench2_many_shot
 dataset_name: manyshot_learning

lm_eval/tasks/longbench2/news_multi.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_multi
+  - longbench2_tasks
+  - longbench2_multi_tasks
 task: longbench2_news_multi
 dataset_name: multinews

lm_eval/tasks/longbench2/table.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_structured
+  - longbench2_tasks
+  - longbench2_structured_tasks
 task: longbench2_table
 dataset_name: table_qa

lm_eval/tasks/longbench2/translate.yaml

 include: _longbench_common_yaml
 tag:
-  - longbench2
-  - longbench2_incontext
+  - longbench2_tasks
+  - longbench2_incontext_tasks
 task: longbench2_translate
 dataset_name: new_language_translation