test: Delete flaky test DeprecatedRestApiClientTest::test_tracking_co…

…ntext (#35094)

Deleted according to flaky test process:
https://2u-internal.atlassian.net/wiki/spaces/TE/pages/12812492/Flaky+Test+Process

Flaky test ticket: https://2u-internal.atlassian.net/browse/CR-6899

Failed multiple times with this error, but not consistently:

```
FAILED lms/djangoapps/commerce/tests/__init__.py::DeprecatedRestApiClientTest::test_tracking_context - requests.exceptions.ConnectionError: HTTPSConnectionPool(host='ecommerce.example.com', port=443): Max retries exceeded with url: /api/v2/baskets/1/ (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7f0708b91f50>: Failed to establish a new connection: [Errno -2] Name or service not known'))
```

Note that there is another test class with a name differing by only one
letter earlier in this file, `DeprecatedRestApiClientTests` (plural), with
a method with the same name. That one hasn't been failing.

lms/djangoapps/commerce/tests/__init__.py

@@ -134,39 +134,6 @@ def setUp(self):
         self.user = UserFactory()
         self.base_url = get_ecommerce_api_base_url()
 
-    @httpretty.activate
-    def test_tracking_context(self):
-        """
-        Ensure the tracking context is set up in the api client correctly and automatically.
-        """
-        with freeze_time('2015-7-2'):
-            # fake an E-Commerce API request.
-            httpretty.register_uri(
-                httpretty.POST,
-                f"{settings.ECOMMERCE_API_URL.strip('/')}/baskets/1/",
-                status=200, body='{}',
-                adding_headers={'Content-Type': JSON}
-            )
-
-            mock_tracker = mock.Mock()
-            mock_tracker.resolve_context = mock.Mock(return_value={'ip': '127.0.0.1'})
-            with mock.patch('openedx.core.djangoapps.commerce.utils.tracker.get_tracker', return_value=mock_tracker):
-                api_url = urljoin(f"{self.base_url}/", "baskets/1/")
-                get_ecommerce_api_client(self.user).post(api_url)
-
-            # Verify the JWT includes the tracking context for the user
-            actual_header = httpretty.last_request().headers['Authorization']
-
-            claims = {
-                'tracking_context': {
-                    'lms_user_id': self.user.id,
-                    'lms_ip': '127.0.0.1',
-                }
-            }
-            expected_jwt = create_jwt_for_user(self.user, additional_claims=claims, scopes=self.SCOPES)
-            expected_header = f'JWT {expected_jwt}'
-            assert actual_header == expected_header
-
     @httpretty.activate
     def test_client_unicode(self):
         """