Various string cleanups (#30435)

* Remove some unnecessary string concatenations

* Replace some simple str.formats with f-strings

* Replace some string concatenations with f-strings

tests/components/hddtemp/test_sensor.py

@@ -155,7 +155,7 @@ class TestHDDTempSensor(unittest.TestCase):
 
         assert len(self.hass.states.all()) == 1
         state = self.hass.states.get("sensor.hd_temperature_dev_sdx1")
-        assert state.attributes.get("friendly_name") == "HD Temperature " + "/dev/sdx1"
+        assert state.attributes.get("friendly_name") == "HD Temperature /dev/sdx1"
 
     @patch("telnetlib.Telnet", new=TelnetMock)
     def test_hddtemp_multiple_disks(self):