ESPHome select for assist pipeline selection (#91526)

* ESPHome: Add assist pipeline select entity

* Add translation strings

* Tests

tests/components/esphome/test_select.py

@@ -0,0 +1,15 @@
+"""Test ESPHome selects."""
+
+
+from homeassistant.core import HomeAssistant
+
+
+async def test_pipeline_selector(
+    hass: HomeAssistant,
+    mock_voice_assistant_v1_entry,
+) -> None:
+    """Test assist pipeline selector."""
+
+    state = hass.states.get("select.test_assist_pipeline")
+    assert state is not None
+    assert state.state == "preferred"