Update EV Charger StatusTracker tests to send mock data by itself

This allows us to remove the last usage of the automatic streaming
tasks provided by the MockMicrogrid from the SDK tests.

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

tests/timeseries/test_ev_charger_pool.py

@@ -32,13 +32,17 @@ async def test_state_updates(self, mocker: MockerFixture) -> None:
             grid_side_meter=False, api_client_streaming=True, sample_rate_s=0.01
         )
         mockgrid.add_ev_chargers(5)
-        mockgrid.start_mock_client(lambda client: client.initialize(mocker))
+        await mockgrid.start(mocker)
 
         state_tracker = StateTracker(set(mockgrid.evc_ids))
+        await asyncio.sleep(0.05)
 
         async def check_states(
             expected: dict[int, EVChargerState],
         ) -> None:
+            await mockgrid.send_ev_charger_data(
+                [0.0] * 5  # for testing status updates, the values don't matter.
+            )
             await asyncio.sleep(0.05)
             for comp_id, exp_state in expected.items():
                 assert state_tracker.get(comp_id) == exp_state