refactor: move TEST_SEPARATOR import to constants module

Moved TEST_SEPARATOR import from benchmarks.base to constants module in codegen, summarization, and translation benchmarks for better modularity and maintainability. This change improves code organization by centralizing constants in a dedicated module.

src/benchmarks/codegen.py

@@ -2,7 +2,8 @@ import logging
 import json
 import os
 from typing import Dict, Any, List
-from benchmarks.base import Benchmark, TEST_SEPARATOR
+from benchmarks.base import Benchmark
+from constants import TEST_SEPARATOR
 
 class CodegenBenchmark(Benchmark):
     """Бенчмарк для тестирования генерации кода."""

src/benchmarks/summarization.py

@@ -2,7 +2,8 @@ import logging
 import json
 import os
 from typing import Dict, Any, List
-from benchmarks.base import Benchmark, TEST_SEPARATOR
+from benchmarks.base import Benchmark
+from constants import TEST_SEPARATOR
 
 class SummarizationBenchmark(Benchmark):
     """Бенчмарк для тестирования пересказов."""

src/benchmarks/translation.py

@@ -2,7 +2,8 @@ import logging
 import json
 import os
 from typing import Dict, Any, List
-from benchmarks.base import Benchmark, TEST_SEPARATOR
+from benchmarks.base import Benchmark
+from constants import TEST_SEPARATOR
 
 class TranslationBenchmark(Benchmark):
     """Бенчмарк для тестирования перевода."""