Fixed #35308 -- Handled OSError when launching code formatters.

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

tests/user_commands/utils.py

@@ -0,0 +1,23 @@
+from io import StringIO
+from unittest import mock
+
+
+class AssertFormatterFailureCaughtContext:
+
+    def __init__(self, test, shutil_which_result="nonexistent"):
+        self.stdout = StringIO()
+        self.stderr = StringIO()
+        self.test = test
+        self.shutil_which_result = shutil_which_result
+
+    def __enter__(self):
+        self.mocker = mock.patch(
+            "django.core.management.utils.shutil.which",
+            return_value=self.shutil_which_result,
+        )
+        self.mocker.start()
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.mocker.stop()
+        self.test.assertIn("Formatters failed to launch", self.stderr.getvalue())