Fix /supervisor/reload after refactoring (#5791)

As discussed in [1], refactoring in #5759 changed signature of the
reload method and CLI now gets unexpected schema when `ha su reload` is
called. Change the method to return None as before and add a test for a
proper body content.

[1] https://github.com/home-assistant/supervisor/pull/5759/files#diff-1b4ed26f31e52ff5fe53efdc695eebacb1e46411f23cce58295591b2b20cd3faR238

Author: sairon

supervisor/api/supervisor.py

@@ -230,9 +230,9 @@ async def update(self, request: web.Request) -> None:
         await asyncio.shield(self.sys_supervisor.update(version))
 
     @api_process
-    def reload(self, request: web.Request) -> Awaitable:
+    async def reload(self, request: web.Request) -> None:
         """Reload add-ons, configuration, etc."""
-        return asyncio.gather(
+        await asyncio.gather(
             asyncio.shield(self.sys_updater.reload()),
             asyncio.shield(self.sys_homeassistant.secrets.reload()),
             asyncio.shield(self.sys_resolution.evaluate.evaluate_system()),

tests/api/test_supervisor.py

@@ -235,6 +235,7 @@ async def test_api_supervisor_reload(api_client: TestClient):
     """Test supervisor reload."""
     resp = await api_client.post("/supervisor/reload")
     assert resp.status == 200
+    assert await resp.json() == {"result": "ok", "data": {}}
 
 
 async def test_api_supervisor_options_timezone(