gh-108303: Fix and move badsyntax_pep3120.py (#109513)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

Lib/test/.ruff.toml

@@ -3,12 +3,12 @@ select = [
     "F811",  # Redefinition of unused variable (useful for finding test methods with the same name)
 ]
 extend-exclude = [
+    # Excluded (these aren't actually executed, they're just "data files")
+    "tokenizedata/*.py",
     # Failed to lint
-    "badsyntax_pep3120.py",
     "encoded_modules/module_iso_8859_1.py",
     "encoded_modules/module_koi8_r.py",
     # Failed to parse
-    "badsyntax_3131.py",
     "support/socket_helper.py",
     "test_fstring.py",
     # TODO Fix: F811 Redefinition of unused name

Lib/test/test_utf8source.py

@@ -1,5 +1,3 @@
-# This file is marked as binary in the CVS, to prevent MacCVS from recoding it.
-
 import unittest
 
 class PEP3120Test(unittest.TestCase):
@@ -16,7 +14,7 @@ class PEP3120Test(unittest.TestCase):
 
     def test_badsyntax(self):
         try:
-            import test.badsyntax_pep3120
+            import test.tokenizedata.badsyntax_pep3120
         except SyntaxError as msg:
             msg = str(msg).lower()
             self.assertTrue('utf-8' in msg)