gh-140172: Skip JSON tools test during PGO training (GH-140809)

Lib/test/test_json/test_tool.py

@@ -13,6 +13,7 @@ from _colorize import get_theme
 
 
 @support.requires_subprocess()
+@support.skip_if_pgo_task
 class TestMain(unittest.TestCase):
     data = """
 
@@ -319,6 +320,7 @@ class TestMain(unittest.TestCase):
 
 
 @support.requires_subprocess()
+@support.skip_if_pgo_task
 class TestTool(TestMain):
     module = 'json.tool'