Remove test that isn't necessary anymore

We don't need to test for unknown fields causing import failures,
because that won't happen anymore.

tests/sentry/runner/commands/test_backup.py

@@ -781,37 +781,6 @@ def test_import_integrity_error_exit_code(self, get_importer_for_model):
 
 
 class BadImportExportCommandTests(TestCase):
-    def test_import_invalid_json(self):
-        with TemporaryDirectory() as tmp_dir:
-            tmp_invalid_json = Path(tmp_dir).joinpath(f"{self._testMethodName}.invalid.json")
-            with open(get_fixture_path("backup", "single-option.json")) as backup_file:
-                models = json.load(backup_file)
-                models[0]["fields"]["invalid_field"] = "invalid_data"
-                with open(tmp_invalid_json, "w") as invalid_input_file:
-                    json.dump(models, invalid_input_file)
-
-            for scope in {"users", "organizations", "config", "global"}:
-                tmp_findings = Path(tmp_dir).joinpath(
-                    f"{self._testMethodName}.{scope}.findings.json"
-                )
-                rv = CliRunner().invoke(
-                    import_,
-                    [
-                        scope,
-                        str(tmp_invalid_json),
-                        "--no-prompt",
-                        "--findings-file",
-                        str(tmp_findings),
-                    ],
-                )
-                assert rv.exit_code == 1, rv.output
-
-                with open(tmp_findings) as findings_file:
-                    findings = json.load(findings_file)
-                    assert len(findings) == 1
-                    assert findings[0]["finding"] == "RpcImportError"
-                    assert findings[0]["kind"] == "DeserializationFailed"
-
     def test_import_file_read_error_exit_code(self):
         rv = CliRunner().invoke(import_, ["global", NONEXISTENT_FILE_PATH, "--no-prompt"])
         assert not isinstance(rv.exception, ImportingError)